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diagnostic value of the recombinant tandem repeat antigen tegm6-4r for surra in water buffaloes.trypanosoma evansi infection, or surra, is currently affecting various species of animals, especially water buffaloes. since diagnosis is an important aspect of surra control, development of novel diagnostic antigens is of interest to implement and improve the currently utilized methods. our study evaluated the tandem repeat antigen tegm6-4r in t. evansi antibody detection in water buffaloes. tegm6-4r-based elisa was performed with 20 positive and 8 negative controls and 484 field samples from w ...201424524896
molecular and seroepidemiological survey of babesia bovis and babesia bigemina infections in cattle and water buffaloes in the central region of vietnam.in the present study, a total of 137 blood samples were collected from cattle and water buffaloes in central region of vietnam and tested using nested polymerase chain reaction (npcr), enzyme-linked immunosorbent assay (elisa) and indirect fluorescent antibody test (ifat) to determine the molecular and serological prevalence of babesia bovis and babesia bigemina. in cattle, the prevalence of b. bovis and b. bigemina was 21.3% and 16.0% by npcr, 73.4% and 42.6% by elisa and 60.6% and 59.6% by ifa ...201425382466
genetic characterization of babesia and theileria parasites in water buffaloes in sri lanka.water buffaloes are thought to be the reservoir hosts for several hemoprotozoan parasites that infect cattle. in the present study, we surveyed sri lankan bred water buffaloes for infections with babesia bovis, babesia bigemina, theileria annulata, and theileria orientalis using parasite-specific pcr assays. when 320 blood-derived dna samples from water buffaloes reared in three different districts (polonnaruwa, mannar, and mullaitivu) of sri lanka were pcr screened, b. bovis, b. bigemina, and t ...201424365246
study of vitellogenin in boophilus annulatus tick larvae and its immunological aspects.boophilus annulatus is an important one-host tick in the mediterranean regions and iran. it can transmit the babesia bigemina, babesia bovis and anaplasma marginale to cattle. nowadays, immunization programs by tick proteins is one of the potential methods for the control and prevention of tick infestations. therefore, the characterization and identification of various tick proteins are necessary. vitellogenin is a precursor of vitellin that is produced in mid gut cells and fat bodies in ticks. ...201425382465
first evaluation of an outbreak of bovine babesiosis and anaplasmosis in southern brazil using multiplex pcr.outbreaks of tick-borne disease cases in santa catarina, brazil are known, but the presence of the pathogen dna has never been determined. in this study, the first survey of anaplasma marginale, babesia bigemina, and babesia bovis dna on blood samples of 33 cattle from an outbreak in ponte alta municipality, santa catarina, brazil, has been carried out. a multiplex pcr detected 54.5% of animals were co-infected with 2 or 3 parasites, while 24.2% were infected with only 1 species. the most preval ...201425352699
occurrence of haemoparasites in cattle in monduli district, northern tanzania.haemoparasite infections are among the most economically important cattle diseases in sub-saharan africa. the present study investigated the occurrence of haemoparasites in 295 indigenous cattle from five villages (mswakini, lake manyara, naitolia, makuyuni and nanja) of the monduli district, a wildlife-domestic animal-human interface area in northern tanzania. the data showed that the overall occurrence of haemoparasites in the sampled cattle was 12.5% (95% ci: 8.7% - 16.3%), involving single a ...201425685864
a proline racemase based pcr for identification of trypanosoma vivax in cattle blood.a study was conducted to develop a trypanosoma vivax (t. vivax) specific pcr based on the t. vivax proline racemase (tvprac) gene. forward and reverse primers were designed that bind at 764-783 bp and 983-1002 bp of the gene. to assess its specificity, tvprac pcr was conducted on dna extracted from different haemotropic pathogens: t. vivax from nigeria, ethiopia and venezuela, t. congolense savannah type, t. brucei brucei, t. evansi, t. equiperdum, t. theileri, theileria parva, anaplasma margina ...201424416292
retrospective study of hemoparasites in cattle in southern italy by reverse line blot hybridization.tick-borne diseases are widespread in tropical and temperate regions and are responsible for important economic losses in those areas. in order to assess the presence and prevalence of various pathogens in southern italy, we retrospectively analyzed cattle blood samples collected for a previous study in 2000 using reverse line blot (rlb) hybridization. the study had been carried out in three regions of southern italy on 1,500 randomly selected and apparently healthy adult cattle. rlb showed that ...201424614604
prevalence survey of selected bovine pathogens in water buffaloes in the north region of brazil.although the largest buffalo herd in the occident is in the north region of brazil, few studies have been conducted to assess the prevalence of selected parasitic diseases in buffalo herd. the present study was therefore conducted to investigate the epidemiological of toxoplasma gondii, neospora caninum, anaplasma marginale, babesia bigemina, and babesia bovis in water buffaloes in the north region of brazil. a total of 4796 buffalo blood samples were randomly collected from five provinces and s ...201424563780
invasive potential of cattle fever ticks in the southern united states.for >100 years cattle production in the southern united states has been threatened by cattle fever. it is caused by an invasive parasite-vector complex that includes the protozoan hemoparasites babesia bovis and b. bigemina, which are transmitted among domestic cattle via rhipicephalus tick vectors of the subgenus boophilus. in 1906 an eradication effort was started and by 1943 boophilus ticks had been confined to a narrow tick eradication quarantine area (teqa) along the texas-mexico border. ho ...201424742062
targeted surface expression of an exogenous antigen in stably transfected babesia bovis.babesia bovis is a tick-borne intraerythocytic protozoan responsible for acute disease in cattle which can be controlled by vaccination with attenuated b. bovis strains. emerging b. bovis transfection technologies may increase the usefulness of these live vaccines. one use of transfected b. bovis parasites may be as a vaccine delivery platform. previous transfection methods for b. bovis were limited by single expression sites and intracellular expression of transfected antigens. this study descr ...201424840336
widespread movement of invasive cattle fever ticks (rhipicephalus microplus) in southern texas leads to shared local infestations on cattle and deer.rhipicephalus (boophilus) microplus is a highly-invasive tick that transmits the cattle parasites (babesia bovis and b. bigemina) that cause cattle fever. r. microplus and babesia are endemic in mexico and ticks persist in the united states inside a narrow tick eradication quarantine area (teqa) along the rio grande. this containment area is threatened by unregulated movements of illegal cattle and wildlife like white-tailed deer (wtd; odocoileus virginianus).201424742041
tick passage results in enhanced attenuation of babesia bovis.serial blood passage of virulent babesia bovis in splenectomized cattle results in attenuated derivatives that do not cause neurologic disease. tick transmissibility can be lost with attenuation, but when retained, attenuated b. bovis can revert to virulence following tick passage. this study provides data showing that tick passage of the partially attenuated b. bovis t2bo derivative strain further decreased virulence compared with intravenous inoculation of the same strain in infected animals. ...201425114111
the ovarian transcriptome of the cattle tick, rhipicephalus (boophilus) microplus, feeding upon a bovine host infected with babesia bovis.cattle babesiosis is a tick-borne disease of cattle with the most severe form of the disease caused by the apicomplexan, babesia bovis. babesiosis is transmitted to cattle through the bite of infected cattle ticks of the genus rhipicephalus. the most prevalent species is rhipicephalus (boophilus) microplus, which is distributed throughout the tropical and subtropical countries of the world. the transmission of b. bovis is transovarian and a previous study of the r. microplus ovarian proteome ide ...201324330595
natural babesia bovis infection in water buffaloes (bubalus bubalis) and crossbred cattle under field conditions in egypt: a preliminary study.there is a little or no data available on the natural babesia bovis (b. bovis) infection in water buffaloes (bubalus bubalis) comparing to the available one for cattle. this study was conducted to investigate the natural b. bovis infection in water buffaloes in comparison to crossbred cattle under field conditions in egypt.201325629060
seroprevalence and risk factors for cattle anaplasmosis, babesiosis, and trypanosomiasis in a brazilian semiarid region.the seroprevalence of anaplasma marginale, babesia bigemina, babesia bovis and trypanosoma vivax and the risk factors for these infections were investigated in 509 cows on 37 farms in the semiarid region of paraíba, northeastern brazil. cow serum samples were tested by means of immunofluorescence assay (ifa) against each specific antigen. the mean seroprevalence values per farm were 15.0% (range: 0-75%) for a. marginale, 9.5% (range: 0-40%) for b. bigemina and 26.9% (range: 0-73.7%) for b. bovis ...201323802235
association of bola-drb3 alleles with tick-borne disease tolerance in dairy cattle in a tropical environment.tick-borne disease is one of the most harmful tropical diseases in dairy production. selection of dairy cows for tolerance to tick-borne disease is a challenging concept for dairy breeders in the tropics. the objectives of this study were (1) to detect specific tick-borne pathogen in cattle of different genetics and (2) to examine the polymorphisms of drb3.2 alleles in thai dairy cattle and find the allelic association with tick-borne disease tolerance. specific primers to anaplasma marginale (a ...201323571121
molecular survey of bovine vector-borne pathogens in cebu, philippines.vector-borne diseases (vbds) continue to threaten the worldwide livestock industry, but comprehensive epidemiological surveys on such diseases have not been conducted in the philippines. in the present study, we screened 408 bovine blood samples from 9 areas in cebu, philippines, for various vbd pathogens using specific pcr assays. the results revealed prevalences of 54.7, 15.4, 10.0, and 12.0% for anaplasma spp., babesia bigemina, babesia bovis, and trypanosoma (tr.) theileri, respectively. in ...201323499481
prevalence of tick-borne pathogens in adult dermacentor spp. ticks from nine collection sites in france.the importance of dermacentor spp. in the transmission of tick-borne pathogens is not well recognized in europe. to investigate the role of dermacentor spp. in the transmission of tick-borne pathogens, questing ticks were collected in 9 sites from southern to northwestern france (camargue delta to eastern brittany) where dermacentor spp. exist and tick-borne diseases had occurred previously. three tick species were collected during the spring and autumn of 2009. collected ticks (both males and f ...201323421886
rapid identification and differentiation of theileria sergenti and theileria sinensis using a loop-mediated isothermal amplification (lamp) assay.the present study developed and validated a species-specific loop-mediated isothermal amplification (lamp) assay for the rapid detection and discrimination of two benign bovine theileria species -t. sergenti and t. sinensis. the lamp assay is inexpensive and easy to perform and involves a rapid reaction-the amplification can be performed in 55 min or 50 min under isothermal conditions of 61°c or 63°c, respectively, by employing a set of four species-specific primer mixtures. the results can be c ...201322947247
artemisone inhibits in vitro and in vivo propagation of babesia bovis and b. bigemina parasites.artemisone was evaluated, in in vitro and in vivo, for control of bovine babesiosis caused by babesia bigemina and babesia bovis parasites. in vitro, artemisone reduced parasitemia in a dose-dependent manner: the inhibitory effects increased gradually, reaching a maximum inhibition of 99.6% and 86.4% for b. bigemina and b. bovis, respectively 72 h after initiation of treatment with initial parasitemia of 0.5%. in calves infected with either b. bigemina or b. bovis artemisone treatment was well t ...201324184077
molecular and serological prevalence of babesia bigemina and babesia bovis in cattle and water buffalos under small-scale dairy farming in beheira and faiyum provinces, egypt.in order to determine the molecular and serological prevalence of babesia bigemina and babesia bovis, a total of 247 blood samples were collected from cattle and water buffalos in beheira and faiyum provinces in egypt and examined by nested polymerase chain reaction (npcr) and enzyme-linked immunosorbent assay (elisa). in cattle, the prevalence of b. bigemina and b. bovis was 5.30% and 3.97% by npcr and 10.60% and 9.27% by elisa, respectively, whereas those of water buffalos were 10.42% and 4.17 ...201324075417
differential expression of three members of the multidomain adhesion ccp family in babesia bigemina, babesia bovis and theileria equi.members of the ccp protein family have been previously described to be expressed on gametocytes of apicomplexan plasmodium parasites. knocking out plasmodium ccp genes blocks the development of the parasite in the mosquito vector, making the ccp proteins potential targets for the development of a transmission-blocking vaccine. apicomplexans babesia bovis and babesia bigemina are the causative agents of bovine babesiosis, and apicomplexan theileria equi causes equine piroplasmosis. bovine babesio ...201323844089
pcr detection and genetic diversity of bovine hemoprotozoan parasites in vietnam.hemoprotozoan infections often cause serious production losses in livestock. in the present study, we conducted a pcr-based survey of babesia bovis, babesia bigemina, theileria annulata, theileria orientalis, trypanosoma evansi and trypanosoma theileri, using 423 dna samples extracted from blood samples of cattle (n=202), water buffaloes (n=43), sheep (n=51) and goats (n=127) bred in the hue and hanoi provinces of vietnam. with the exception of t. annulata and t. evansi, all other parasite speci ...201323856762
molecular characterization and antigenic properties of a novel babesia gibsoni glutamic acid-rich protein (bggarp).identification and molecular characterization of babesia gibsoni proteins with potential antigenic properties are crucial for the development and validation of the serodiagnostic method. in this study, we isolated a cdna clone encoding a novel b. gibsoni 76-kda protein by immunoscreening of the parasite cdna library. computer analysis revealed that the protein presents a glutamic acid-rich region in the c-terminal. therefore, the protein was designated as b. gibsoni glutamic acid-rich protein (b ...201323968686
molecular diagnosis and phylogenetic analysis of babesia bigemina and babesia bovis hemoparasites from cattle in south africa.babesia parasites, mainly babesia bovis and b. bigemina, are tick-borne hemoparasites inducing bovine babesiosis in cattle globally. the clinical signs of the disease include, among others, anemia, fever and hemoglobinuria. babesiosis is known to occur in tropical and subtropical regions of the world. in this study, we aim to provide information about the occurrence and phylogenetic relationship of b. bigemina and b. bovis species in cattle from different locations in nine provinces of south afr ...201323927555
molecular characterization of a new babesia bovis thrombospondin-related anonymous protein (bbtrap2).a gene encoding a babesia bovis protein that shares significant degree of similarity to other apicomplexan thrombospondin-related anonymous proteins (traps) was found in the genomic database and designated as bbtrap2. recombinant protein containing a conserved region of bbtrap2 was produced in e. coli. a high antigenicity of recombinant bbtrap2 (rbbtrap2) was observed with field b. bovis-infected bovine sera collected from geographically different regions of the world. moreover, antiserum agains ...201324349483
evaluation of the growth-inhibitory effect of trifluralin analogues on in vitro cultured babesia bovis parasites.bovine babesiosis, caused by babesia bovis, is a global tick borne hemoprotozoan parasite disease characterized by fever, anemia, weight losses and ultimately death. several babesicidal drugs that have been in use in cattle for years have proven to be only partially effective and the development of alternative chemotherapeutics that are highly specific and have low toxicity against babesiosis is needed. trifluralin derivatives specifically bind alpha-tubulin in plants and protozoa parasites caus ...201324533294
evidence for extensive genetic diversity and substructuring of the babesia bovis metapopulation.babesia bovis is a tick-transmitted haemoprotozoan and a causative agent of bovine babesiosis, a cattle disease that causes significant economic loss in tropical and subtropical regions. a panel of nineteen micro- and minisatellite markers was used to estimate population genetic parameters of eighteen parasite isolates originating from different continents, countries and geographic regions including north america (mexico, usa), south america (argentina, brazil), the middle east (israel) and aust ...201324589113
babesia bovis infection in cattle in the southwestern brazilian amazon.the present study provides the first epidemiological data on infection with babesia bovis in cattle raised in the southwestern brazilian amazon. blood clot samples were filtered through nylon cloth before being submitted to dna extraction. pcr and nested-pcr were applied to assess the frequency of infection with b. bovis in calves with ages from 4 to 12 months bred in 4 microregions each in the states of rondônia and acre. after the dna was extracted from the samples, the infection in cattle was ...201323312480
babesia bovis: lipids from virulent s2p and attenuated r1a strains trigger differential signalling and inflammatory responses in bovine macrophages.the intra-erythrocytic protozoan babesia bovis is an economically important pathogen that causes an acute and often fatal infection in adult cattle. babesiosis limitation depends on the early activation of macrophages, essential cells of the host innate immunity, which can generate an inflammatory response mediated by cytokines and nitric oxide (no). herein, we demonstrate in bovine macrophages that lipids from b. bovis attenuated r1a strain (la) produced a stronger no release, an early tnfα mrn ...201323286221
library of apicomplexan metabolic pathways: a manually curated database for metabolic pathways of apicomplexan parasites.the library of apicomplexan metabolic pathways (lamp, http://www.llamp.net) is a web database that provides near complete mapping from genes to the central metabolic functions for some of the prominent intracellular parasites of the phylum apicomplexa. this phylum includes the causative agents of malaria, toxoplasmosis and theileriosis-diseases with a huge economic and social impact. a number of apicomplexan genomes have been sequenced, but the accurate annotation of gene function remains challe ...201323193253
the molecular prevalence and msa-2b gene-based genetic diversity of babesia bovis in dairy cattle in thailand.bovine babesiosis is an economically significant disease that affects dairy farming operations in thailand. in the present study, 1824 blood-dna samples prepared from cattle bred in 4 different regions of the country (north, northeast, central, and south) were screened using a nested pcr for the specific detection of babesia bovis. while the overall prevalence of b. bovis was 8.8%, the central region of thailand was found to be a high-risk area of the country, as the prevalence of the parasite w ...201323953761
evaluation of a real-time pcr assay based on the single-copy sag1 gene for the detection of toxoplasma gondii.real-time pcr-based detection of toxoplasma gondii is very sensitive and convenient for diagnosing toxoplasmosis. however, the performance of the pcr assays could be influenced by the target gene chosen. here we evaluate a real-time pcr assay using double-stranded dna dyes (sybr(®) green i assay) with a new set of primers targeting the sag1 gene for the fast and specific detection of t. gondii. the assay showed higher sensitivity than conventional pcr protocols using t. gondii dna as template. t ...201323867074
molecular and serological prevalence of babesia bovis and babesia bigemina in water buffaloes in the north region of brazil.bovine babesiosis is a tick-borne disease caused mainly by babesia bovis and babesia bigemina, which are associated to considerable economic losses in cattle herds worldwide. approximately 60% of buffalo herds in south america are located in northern brazil. little is known about the impact of babesiosis on buffalo herds in brazil. the present work aimed to verify the occurrence of b. bovis and b. bigemina in 542 water buffaloes in the state of pará, northern brazil, using molecular and serologi ...201323790545
inhibitory effect of cyclophilin a from the hard tick haemaphysalis longicornis on the growth of babesia bovis and babesia bigemina.haemaphysalis longicornis is known as one of the most important ticks transmitting babesia parasites in east asian countries, including babesia ovata and babesia gibsoni, as well as theileria parasites. h. longicornis is not the natural vector of babesia bovis and babesia bigemina. vector ticks and transmitted parasites are thought to have established unique host-parasite interaction for their survival, meaning that vector ticks may have defensive molecules for the growth control of parasites in ...201323532543
epidemiological survey of babesia bovis and babesia bigemina infections of cattle in philippines.a total of 250 blood samples were collected from clinically healthy cattle in five provinces of philippines. dna was extracted from the samples and analyzed by nested pcr assays for an epidemiological survey of babesia bovis and babesia bigemina infections. out of the 250 samples, 27 (10.8%) and 16 (6.4%) were positive for b. bovis infection and b. bigemina infection, respectively. mixed infections were detected in a total of 4 samples (1.6%). our data provide baseline information regarding the ...201323470278
evaluation of in vitro and in vivo inhibitory effects of fusidic acid on babesia and theileria parasites.fusidic acid known to has antibacterial, antifungal, and antimalarial activities. fusidic acid blocks translation elongation factor g gene in plasmodium falciparum. in the present study, the inhibitory effects of fusidic acid on the in vitro growth of bovine and equine babesia parasites were evaluated. the inhibitory effect of fusidic acid on the in vivo growth of babesia microti was also assessed. the in vitro growth of four babesia species that were tested was significantly inhibited (p<0.05) ...201322985928
the genetic diversity of merozoite surface antigen 1 (msa-1) among babesia bovis detected from cattle populations in thailand, brazil and ghana.in the present study, we screened blood dna samples obtained from cattle bred in brazil (n=164) and ghana (n=80) for babesia bovis using a diagnostic pcr assay and found prevalences of 14.6% and 46.3%, respectively. subsequently, the genetic diversity of b. bovis in thailand, brazil and ghana was analyzed, based on the dna sequence of merozoite surface antigen-1 (msa-1). in thailand, msa-1 sequences were relatively conserved and found in a single clade of the phylogram, while brazilian msa-1 seq ...201323856760
genetic diversity of merozoite surface antigens in babesia bovis detected from sri lankan cattle.babesia bovis, the causative agent of severe bovine babesiosis, is endemic in sri lanka. the live attenuated vaccine (k-strain), which was introduced in the early 1990s, has been used to immunize cattle populations in endemic areas of the country. the present study was undertaken to determine the genetic diversity of merozoite surface antigens (msas) in b. bovis isolates from sri lankan cattle, and to compare the gene sequences obtained from such isolates against those of the k-strain. forty-fou ...201323851021
loss of neurovirulence is associated with reduction of cerebral capillary sequestration during acute babesia bovis infection.severe neurological signs that develop during acute infection by virulent strains of babesia bovis are associated with sequestration of infected erythrocytes in cerebral capillaries. serial passage of virulent strains in cattle results in attenuated derivatives that do not cause neurologic disease. we evaluated whether serial passage also results in a loss of cerebral capillary sequestration by examining brain biopsies during acute disease and at necropsy.201323777713
gut transcriptome of replete adult female cattle ticks, rhipicephalus (boophilus) microplus, feeding upon a babesia bovis-infected bovine host.as it feeds upon cattle, rhipicephalus (boophilus) microplus is capable of transmitting a number of pathogenic organisms, including the apicomplexan hemoparasite babesia bovis, a causative agent of bovine babesiosis. the r. microplus female gut transcriptome was studied for two cohorts: adult females feeding on a bovine host infected with b. bovis and adult females feeding on an uninfected bovine. rna was purified and used to generate a subtracted cdna library from b. bovis-infected female gut, ...201323749091
diagnostic methods used to monitor an outbreak of babesiosis (babesia bovis) in a herd of feral cattle in new caledonia.in december 2007, babesia bovis was introduced to new caledonia through the importation of cattle vaccinated with a live tick fever (babesiosis and anaplasmosis) vaccine. medical measures, acaricide and antiprotozoal treatments, and quarantine restrictions were implemented with success on all the farms involved, but the disease spread to one of the neighbouring properties where feral cattle were present. to circumscribe and eliminate this outbreak, the authorities decided to slaughter all animal ...201323718796
molecular detection and identification of hemoparasites in pampas deer (ozotoceros bezoarticus linnaeus, 1758) from the pantanal brazil.hemoparasites were surveyed in 60 free-living pampas deer ozotoceros bezoarticus from the central area of the pantanal, known as nhecolândia, state of mato grosso do sul, brazil, through the analysis of nested pcr assays and nucleotide sequencing. blood samples were tested for babesia/theileria, anaplasma spp., and trypanosoma spp. using npcr assays and sequencing of the 18s rrna, msp4, its, and cathepsin l genes. the identity of each sequence was confirmed by comparison with sequences from genb ...201323567028
bioinformatic prediction of the exportome of babesia bovis and identification of novel proteins in parasite-infected red blood cells.babesia bovis is a pathogen of considerable economic significance to the livestock industry worldwide but the precise mechanisms by which this parasite causes disease in susceptible cattle remain poorly understood. it is clear, however, that alterations to the structure and function of red blood cells in which the parasites reside and replicate play an important role in pathogenesis and that these are secondary to the export of numerous, currently unknown and uncharacterised parasite-encoded pro ...201323395698
delivery of recombinant vaccines against bovine herpesvirus type 1 gd and babesia bovis msa-2c to mice using liposomes derived from egg yolk lipids.liposomes prepared from total egg yolk lipid extracts were used to deliver experimental dna vaccines to mice consisting of pci-neo plasmids encoding bovine herpesvirus type 1 (bohv-1) gd or babesia bovis msa-2c. a significantly higher proportion of mice in the b. bovis msa-2c group, but not those in the bohv-1 gd group, developed detectable immunoglobulin g responses when vaccinated with liposome encapsulated dna in comparison with mice vaccinated with naked dna. in both groups, antibody titres ...201323183017
unusual chromatin structure associated with monoparalogous transcription of the babesia bovis ves multigene family.rapid antigenic variation in babesia bovis involves the variant erythrocyte surface antigen-1 (vesa1), a heterodimeric protein with subunits encoded by two branches of the ves multigene family. the ves1α and ves1β gene pair encoding vesa1a and 1b, respectively, are transcribed in a monoparalogous manner from a single locus of active ves transcription (lat), just one of many quasi-palindromic ves loci. to determine whether this organization plays a role in transcriptional regulation, chromatin st ...201323178996
bovine babesiosis in the 21st century: advances in biology and functional genomics.bovine babesiosis caused by the protozoan parasite, babesia bovis, remains a significant cause of avoidable economic losses to the livestock industry in many countries throughout the world. the molecular mechanisms underlying the pathophysiology of severe disease in susceptible cattle are not well understood and the tools available to study the biology of the parasite, including technologies for genetic manipulation, have only recently been developed. recent availability of multiple parasite gen ...201323068911
specific antibody to a conserved region of babesia apical membrane antigen-1 inhibited the invasion of b. bovis into the erythrocyte.apical membrane antigen-1 (ama-1) is a microneme protein that exists in all apicomplexan parasites and plays an indispensable role in the invasion into host cell. central region of ectodomains i and ii of babesia bovis apical membrane antigen-1 (bbama-1p) is highly conserved with these of babesia species and may be beneficial for vaccine development against babesiosis. in the present study, recombinant protein encoding the central region of b. bovis ama-1 (rbbama-1p) was produced in escherichia ...201324090565
comparative transcriptome analysis of geographically distinct virulent and attenuated babesia bovis strains reveals similar gene expression changes through attenuation.loss of virulence is a phenotypic adaptation commonly seen in prokaryotic and eukaryotic pathogens. this mechanism is not well studied, especially in organisms with multiple host and life cycle stages such as babesia, a tick-transmitted hemoparasite of humans and animals. b. bovis, which infects cattle, has naturally occurring virulent strains that can be reliably attenuated in vivo. previous studies suggest the virulence loss mechanism may involve post-genomic modification. we investigated the ...201324195453
comparative genome analysis of three eukaryotic parasites with differing abilities to transform leukocytes reveals key mediators of theileria-induced leukocyte transformation.we sequenced the genome of theileria orientalis, a tick-borne apicomplexan protozoan parasite of cattle. the focus of this study was a comparative genome analysis of t. orientalis relative to other highly pathogenic theileria species, t. parva and t. annulata. t. parva and t. annulata induce transformation of infected cells of lymphocyte or macrophage/monocyte lineages; in contrast, t. orientalis does not induce uncontrolled proliferation of infected leukocytes and multiplies predominantly withi ...201222951932
inhibitory effects of pepstatin a and mefloquine on the growth of babesia parasites.we evaluated the inhibitory effects of pepstatin a and mefloquine on the in vitro and in vivo growths of babesia parasites. the in vitro growth of babesia bovis, b. bigemina, b. caballi, and b. equi was significantly inhibited (p < 0.05) by micromolar concentrations of pepstatin a (50% inhibitory concentrations = 38.5, 36.5, 17.6, and 18.1 μm, respectively) and mefloquine (50% inhibitory concentrations = 59.7, 56.7, 20.7, and 4 μm, respectively). furthermore, both reagents either alone at a conc ...201222890034
babesia bovis biological clones and the inter-strain allelic diversity of the bv80 gene support subpopulation selection as a mechanism involved in the attenuation of two virulent isolates.the virulence phenotype of babesia bovis subpopulations was evaluated using biological clones derived from the high-virulence bbos2p and the low-virulence bbor1a strain and two original virulent isolates, bbol15 and bbol17, multiplied extensively in vitro or attenuated by successive passages in splenectomized calves. the virulence phenotype was assessed both by inoculation of normal holstein adult steers and by analyses of polymorphic fragments of the single-copy bv80 gene as a subpopulation mar ...201222820058
diversity of eukaryotic translational initiation factor eif4e in protists.the greatest diversity of eukaryotic species is within the microbial eukaryotes, the protists, with plants and fungi/metazoa representing just two of the estimated seventy five lineages of eukaryotes. protists are a diverse group characterized by unusual genome features and a wide range of genome sizes from 8.2 mb in the apicomplexan parasite babesia bovis to 112,000-220,050 mb in the dinoflagellate prorocentrum micans. protists possess numerous cellular, molecular and biochemical traits not obs ...201222778692
acute and persistent infection by a transfected mo7 strain of babesia bovis.a mo7-derived babesia bovis line stably transfected with the gfp-bsd gene was inoculated into two four to five months old calves, while two additional calves were inoculated with mo7 parasites. similar mild clinical signs were detected in all calves. b. bovis rap-1 was identified in the bloodstream by pcr four days post inoculation (dpi), and consistently over ten months thereafter. transfusion of blood from experimentally infected calves into four naïve splenectomized calves at 212 dpi resulted ...201222669120
apicoap: the first computational model for identifying apicoplast-targeted proteins in multiple species of apicomplexa.most of the parasites of the phylum apicomplexa contain a relict prokaryotic-derived plastid called the apicoplast. this organelle is important not only for the survival of the parasite, but its unique properties make it an ideal drug target. the majority of apicoplast-associated proteins are nuclear encoded and targeted post-translationally to the organellar lumen via a bipartite signaling mechanism that requires an n-terminal signal and transit peptide (tp). attempts to define a consensus moti ...201222574192
babesia bovis: a bipartite signal directs the glutamyl-trna synthetase to the apicoplast.babesia bovis contains a prokaryotic derived organelle known as the apicoplast. many participants of the metabolic pathways within the apicoplast are encoded in the nuclear genome and post-translationally imported with the help of a bipartite signal. recently, an all encompassing algorithm was derived to predict apicoplast targeted proteins for many non-plasmodium apicomplexans in which it reported the presence of 260 apicoplast targeted proteins in babesia. one of these proteins is glutamyl trn ...201222561041
gliding motility of babesia bovis merozoites visualized by time-lapse video microscopy.babesia bovis is an apicomplexan intraerythrocytic protozoan parasite that induces babesiosis in cattle after transmission by ticks. during specific stages of the apicomplexan parasite lifecycle, such as the sporozoites of plasmodium falciparum and tachyzoites of toxoplasma gondii, host cells are targeted for invasion using a unique, active process termed "gliding motility". however, it is not thoroughly understood how the merozoites of b. bovis target and invade host red blood cells (rbcs), and ...201222506073
validation and field evaluation of a competitive enzyme-linked immunosorbent assay for diagnosis of babesia bovis infections in argentina.infections by babesia bovis limit cattle production and cause important economic losses in tropical and subtropical areas around the world. monitoring of calf sera can be used to detect unprotected cattle herds and to decide on strategic control measures, as well as for epidemiological studies. merozoite surface antigen 2c (msa-2c) is an immunodominant surface protein expressed in b. bovis merozoites and sporozoites and contains b-cell epitopes that are conserved among geographic isolates. a mon ...201222492742
genetic conservation of potentially immunogenic proteins among brazilian isolates of babesia bovis.bovine babesiosis caused by babesia bovis remains an important constraint for the development of cattle industries worldwide. effective control can be achieved by vaccination with live attenuated phenotypes of the parasite. however, these vaccines have a number of drawbacks, which justifies the search for better, safer vaccines. in recent years, a number of parasite proteins with immunogenic potential have been discovered. however, there is little information on the genetic conservation of these ...201222309798
detection of babesia bovis in blood samples and its effect on the hematological and serum biochemical profile in large ruminants from southern punjab.to determine the presence of babesia bovis (b. bovis) in large ruminants in southern punjab and its effect on hematological and serum biochemical profile of host animals.201223569878
characterization of the unusual bidirectional ves promoters driving vesa1 expression and associated with antigenic variation in babesia bovis.rapid clonal antigenic variation in babesia bovis involves the variant erythrocyte surface antigen-1 (vesa1) protein expressed on the infected-erythrocyte surface. because of the significance of this heterodimeric protein for demonstrated mechanisms of parasite survival and virulence, there is a need to understand how expression of the ves multigene family encoding this protein is controlled. as an initial step toward this goal, we present here initial characterization of the ves promoter drivin ...201222286091
monitoring piroplasms infection in three cattle farms in minorca (balearic islands, spain) with previous history of clinical piroplamosis.bovine piroplasmosis are tick-borne protozoan diseases caused by parasites of the genera theileria and babesia. three friesian cattle farms (f1-f3) with previous history of clinical piroplamosis were selected in minorca (balearic islands, spain). blood samples were collected from 8 to 11 animals every two months throughout a year and, a newly developed multiplex dna bead-based suspension array based on the luminex(®) xmap technology was used to monitor for the presence of piroplasms. the assay i ...201222884914
cloning and characterization of histone deacetylase from babesia bovis.the effect of inhibitors of histone deacetylase (hdac) on apicomplexa has been previously reported with the discovery of apicidin, a cyclic tetrapeptide having broad-spectrum antiparasitic activity. in the current study, we expressed babesia bovis (b. bovis) recombinant-hdac 3 (rbbhdac3) as a gst-fusion protein in escherichia coli (e. coli) and found that it was antigenic. an antiserum against the recombinant protein was generated in mice. the mice serum demonstrated the presence of hdac in b. b ...201222818786
a pcr-based survey of selected babesia and theileria parasites in cattle in sri lanka.hemoprotozoan parasites are responsible for significant economic losses in cattle. we screened sri lankan cattle populations for the presence of babesia bovis, babesia bigemina, theileria annulata, and theileria orientalis, using species-specific pcr assays. out of 316 samples collected from animals in four different districts of sri lanka (nuwara eliya, polonnaruwa, ampara, and jaffna), 231 (73.1%) were positive for at least one parasite species. all four parasite species were detected among th ...201222673106
apicoplast-targeting antibacterials inhibit the growth of babesia parasites.the apicoplast housekeeping machinery, specifically apicoplast dna replication, transcription, and translation, was targeted by ciprofloxacin, thiostrepton, and rifampin, respectively, in the in vitro cultures of four babesia species. furthermore, the in vivo effect of thiostrepton on the growth cycle of babesia microti in balb/c mice was evaluated. the drugs caused significant inhibition of growth from an initial parasitemia of 1% for babesia bovis, with 50% inhibitory concentrations (ic(50)s) ...201222391527
molecular detection and identification of babesia bovis and babesia bigemina in cattle in northern thailand.although babesia bovis and babesia bigemina infections cause economic losses in the cattle industry in northern thailand, there is inadequate information on babesia isolates present in the area. therefore, to determine the prevalence and genetic relationship between babesia isolates, we screened 200 blood samples of cattle from chiang rai, chiang mai, and lumpang provinces of northern thailand. a nested polymerase chain reaction using primers targeting b. bovis spherical body protein 2 (bbosbp2) ...201222645033
loop-mediated isothermal amplification (lamp) method based on two species-specific primer sets for the rapid identification of chinese babesia bovis and b. bigemina.bovine babesiosis is a tick-transmitted hemoprotozoan disease that is mainly caused by babesia bovis and/or babesia bigemina and is characterized by significant morbidity and mortality worldwide. this disease is widespread in most parts of china. however, it is difficult to rapidly discriminate between the b. bovis and b. bigemina species. to detect and distinguish these species, a loop-mediated isothermal amplification (lamp) platform that targets specific sequences of the internal transcribed ...201222849831
prevalence and molecular detection of anaplasma marginale, babesia bovis and babesia bigemina in cattle from puntarenas province, costa rica.a study was conducted in 2008 to determine the prevalence of anaplasma and babesia infections in cattle in the puntarenas province of costa rica. blood samples were taken from a total of 449 cattle during the month of march at 30 farms in the region of espiritu santu, costa rica. commercially available enzyme-linked immunosorbent assays (elisa) were used to determine presence of antibodies to babesia bigemina and anaplasma marginale, and real-time pcr was used to determine the presence of dna fr ...201222465150
analysis of babesia bovis infection-induced gene expression changes in larvae from the cattle tick, rhipicephalus (boophilus) microplus.cattle babesiosis is a tick-borne disease of cattle that has severe economic impact on cattle producers throughout the world's tropical and subtropical countries. the most severe form of the disease is caused by the apicomplexan, babesia bovis, and transmitted to cattle through the bite of infected cattle ticks of the genus rhipicephalus, with the most prevalent species being rhipicephalus (boophilus) microplus. we studied the reaction of the r. microplus larval transcriptome in response to infe ...201222871314
target specific-trisubstituted pyrrole inhibits babesia bovis erythrocytic growth.babesiosis, a significant veterinary disease and an emerging zoonotic human infection, is caused by certain species of the protozoan parasite, babesia. here we report that a trisubstituted pyrrole is a potent inhibitor of babesia bovis, a bovine parasite. furthermore, b. bovis expresses the known target of the compound, the cgmp dependent protein kinase. target conservation and the in vitro efficacy support further investigation of this compound and validation of babesia cgmp dependent protein k ...201223274642
blocking babesia bovis vaccine reactions of dairy cattle in milk.the use of 1.16 mg/kg (one third) of the recommended dose of diminazene aceturate, administered indiscriminately to cattle on day seven of the unfrozen babesia bovis and babesia bigemina bivalent live blood vaccine reaction, was an infection and block treatment method of immunisation used successfully with no known adverse effect on the parasites or the development of protective immunity. continuing with this practice after replacement of the unfrozen vaccine with deep-frozen monovalent b. bovis ...201223327323
multi-locus typing scheme for babesia bovis and babesia bigemina reveals high levels of genetic variability in strains from northern argentina.bovine babesiosis, caused by the protozoa babesia bovis and babesia bigemina, is a tick-borne disease distributed in tropical regions worldwide. current control measures are based on the use of acaricides and live attenuated vaccines. the major economic impact of babesiosis lies in the cattle industry. in order to gain insight into the extent of genetic diversity in populations of parasites in the field, we developed two mlst schemes for the molecular genotyping of b. bigemina and b. bovis. we h ...201223287026
comparison of diagnostic methods to detect piroplasms in asymptomatic cattle.this study was carried out to compare different diagnostic techniques to reveal the presence of piroplasms in asymptomatic cattle kept at pasture. nineteen blood samples were collected from animals of two different areas of emilia romagna region of italy and processed for microscopic observation, pcr, serological test (ifat) for babesia bovis and babesia bigemina antibodies and in vitro cultivation. the cultures were performed on both bovine and ovine erythrocytes. seventeen blood smears (89%) w ...201221846583
functional genomics studies of rhipicephalus (boophilus) annulatus ticks in response to infection with the cattle protozoan parasite, babesia bigemina.ticks are obligate haematophagous ectoparasites of wild and domestic animals as well as humans, considered to be second worldwide to mosquitoes as vectors of human diseases, but the most important vectors of disease-causing pathogens in domestic and wild animals. babesia spp. are tick-borne pathogens that cause a disease called babesiosis in a wide range of animals and in humans. in particular, babesia bovis and babesia bigemina are transmitted by cattle ticks, rhipicephalus (boophilus) annulatu ...201222265898
molecular and serological prevalence of babesia bovis and babesia bigemina in cattle from central region of syria.a total of 207 bovine blood samples were collected from clinically healthy cattle bred in central region of syria and examined by giemsa-stained blood smears, nested pcr, elisa, and ifat to determine the molecular and serological prevalence of babesia bovis and b. bigemina. all samples were negative to babesia spp. by microscopic examination of blood smears. on the other hand, the overall prevalence of b. bovis and b. bigemina was 9.18% and 15.46% by npcr, 15.46% and 18.84% by elisa, and 18.36% ...201222265803
farsenyl pyrophosphate synthase is a potential molecular drug target of risedronate in babesia bovis.a cdna encoding farnesyl pyrophosphate synthase of babesia bovis (bbfpps) has been isolated, cloned and characterized as molecular drug target. sequence analysis revealed that bbfpps contains an open reading frame of 1011bp with predicted 336 amino acids and molecular mass of 38kda. antiserum raised in mice against recombinant bbfpps expressed in escherichia coli specifically reacted with native protein of b. bovis parasites by western blot analysis and indirect immunofluorescent test. enzymatic ...201223276703
development of a multiplex pcr assay for simultaneous detection of theileria annulata, babesia bovis and anaplasma marginale in cattle.tropical theileriosis, bovine babesiosis and anaplasmosis are tick-borne protozoan diseases that impose serious constraints on the health and productivity of domestic cattle in tropical and sub-tropical regions of the world. a common feature of these diseases is that, following recovery from primary infection, animals become persistent carriers of the pathogen and continue to play a critical role in disease epidemiology, acting as reservoirs of infection. this study describes development and eva ...201223183165
Anti-babesial activity of a potent peptide fragment derived from longicin of Haemaphysalis longicornis.Babesiosis is one of the most important tick-borne diseases affecting livestock that can cause major economic losses worldwide particularly in the tropics. Control relies on controlling both the protozoan parasite and the tick vector. Antiprotozoal drugs are most commonly used for treatment, but problems on emergence of resistant strains and food residues are encountered. Longicin, a defensin-like peptide identified from the hard tick, Haemapysalis longicornis, as well as one of its synthetic pa ...201222102016
structure of fructose bisphosphate aldolase from bartonella henselae bound to fructose 1,6-bisphosphate.fructose bisphosphate aldolase (fbpa) enzymes have been found in a broad range of eukaryotic and prokaryotic organisms. fbpa catalyses the cleavage of fructose 1,6-bisphosphate into glyceraldehyde 3-phosphate and dihydroxyacetone phosphate. the ssgcid has reported several fbpa structures from pathogenic sources, including the bacterium brucella melitensis and the protozoan babesia bovis. bioinformatic analysis of the bartonella henselae genome revealed an fbpa homolog. the b. henselae fbpa enzym ...201121904049
Stable expression of green fluorescent protein and targeted disruption of thioredoxin peroxidase-1 gene in Babesia bovis with the WR99210/dhfr selection system.We have achieved stable expression of green fluorescent protein (GFP) in Babesia bovis by using the WR99210/human dihydrofolate reductase (DHFR) gene selection system. A GFP-expression plasmid with a dhfr expression cassette (DHFR-gfp) was constructed and transfected into B. bovis by nucleofection. Following WR99210 selection, a GFP-fluorescent parasite population was obtained and the fluorescent parasite was maintained for more than 7 months under WR99210 drug pressure. The DHFR-gfp was used to ...201122108434
inhibitor-bound complexes of dihydrofolate reductase-thymidylate synthase from babesia bovis.babesiosis is a tick-borne disease caused by eukaryotic babesia parasites which are morphologically similar to plasmodium falciparum, the causative agent of malaria in humans. like plasmodium, different species of babesia are tuned to infect different mammalian hosts, including rats, dogs, horses and cattle. most species of plasmodium and babesia possess an essential bifunctional enzyme for nucleotide synthesis and folate metabolism: dihydrofolate reductase-thymidylate synthase. although thymidy ...201121904052
phylogenetic relationships of mongolian babesia bovis isolates based on the merozoite surface antigen (msa)-1, msa-2b, and msa-2c genes.we conducted a molecular epidemiological study on babesia bovis in mongolia. three hundred blood samples collected from cattle grazed in seven different districts were initially screened using a previously established diagnostic polymerase chain reaction (pcr) assay for the detection of b. bovis-specific dna. positive samples were then used to amplify and sequence the hyper-variable regions of three b. bovis genes encoding the merozoite surface antigen (msa)-1, msa-2b, and msa-2c. the diagnostic ...201122004913
New insights into the epidemiology of bovine piroplasmoses in Italy.Few studies have been published on bovine piroplasmoses in Italy, and therefore a clear picture of the epidemiology of these infections is difficult to obtain. Vertebrate and invertebrate hosts in Central and Northern Regions of Italy were investigated in 2005 and 2006, when microscopy, molecular tools and serological tests were applied to 468 blood samples drawn from cattle in order to evaluate the presence of these protozoa and identify possible risk factors. Ticks were also collected, identif ...201121864982
expression and strain variation of the novel "small open reading frame" (smorf) multigene family in babesia bovis.small open reading frame (smorf) genes comprise the second largest babesia bovis multigene family. all known 44 variant smorf genes are located in close chromosomal proximity to ves1 genes, which encode proteins that mediate cytoadhesion and contribute to immune evasion. in this study, we characterised the general topology of smorf genes and investigated the gene repertoire, transcriptional profile and smorf expression in two distinct strains, t2bo and mo7. sequence analysis using degenerate pri ...201122138017
a highly sensitive dna bead-based suspension array for the detection and species identification of bovine piroplasms.piroplasms are among the most harmful tick-borne pathogens for livestock and sensitive and specific diagnostic methods for rapid detection and identification of the different species are needed for effective control. reverse line blot has been the molecular technique of choice but it is laborious, time-consuming and highly susceptible to subjective variation in the interpretation of the hybridisation signal. here, an oligonucleotide multiplex suspension microarray (luminex® microsphere system) w ...201122233830
occurrence of theileria and babesia species in water buffalo (bubalus babalis, linnaeus, 1758) in the hubei province, south china.the presence and prevalence of tick-borne haemoparasites in water buffalo from the hubei province, south china was investigated using the reverse line blot (rlb) hybridization assay and phylogenetic analysis of the parasite 18s rrna gene. theileria buffeli (19.1%) was the most frequently found species in all of the locations, followed by babesia orientalis (8.9%), babesia bovis (1.0%) and babesia bigemina (0.7%). only 12 (3.9%) of the samples had mixed infections. eleven samples with single infe ...201122154255
Characterization of acyl carrier protein and LytB in Babesia bovis apicoplast.The apicoplast is a highly specialized organelle that mediates required functions in the growth and replication of apicomplexan parasites. Despite structural conservation of the apicoplast among different parasite genera and species, there are also critical differences in the metabolic requirements of different parasites and at different stages of the life cycle. To specifically compare apicoplast pathways between parasites that have both common and unique stages, we characterized the apicoplast ...201122057350
Genetic diversity of Babesia bovis in virulent and attenuated strains.SUMMARYThe aim of this study was to compare the genetic diversity of the single copy Bv80 gene sequences of Babesia bovis in populations of attenuated and virulent parasites. PCR/ RT-PCR followed by cloning and sequence analyses of 4 attenuated and 4 virulent strains were performed. Multiple fragments in the range of 420 to 744 bp were amplified by PCR or RT-PCR. Cloning of the PCR fragments and sequence analyses revealed the presence of mixed subpopulations in either virulent or attenuated para ...201122075976
[molecular characterization of babesia bovis msa-2c gene].objective: this study was carried out to determine the molecular characterization of msa-2c gene of one babesia bovis isolate from cattle in the aegean region and to compare identities with similar isolates from the world and turkey. methods: between 2008-2010 blood samples were collected from a total of 235 cattle localized in 9 provinces of the marmara and aegean regions. smears were prepared, genomic dna's were extracted from the blood samples and investigated for babe ...201122203502
secretion of a new spherical body protein of babesia bovis into the cytoplasm of infected erythrocytes.a cdna encoding a new babesia bovis spherical body protein 4 (bbsbp-4) was reported to have no significant homology to other apicomplexan proteins or previously reported b. bovis spherical body proteins. in the present study, we further examined the molecular characteristics of bbsbp-4 including the expression and cellular localization of the bbsbp-4. an anti-rbbsbp-4 mouse serum specifically reacted to a 41-kda native protein b. bovis in western blot analysis. the immunoelectron microscopic exa ...201121406202
a novel neutralization sensitive and subdominant rap-1-related antigen (rra) is expressed by babesia bovis merozoites.summaryobjective. the babesia bovis genome encodes a rap-1 related gene denominated rap-1 related antigen (rra). in this study, we analysed the pattern of expression, immunogenicity and functional relevance of rra. methods. phylogenetic analysis was performed using the program phylip. expression of rra was analysed by northern blots, rt-pcr, immunoprecipitation, western blots and immunofluorescence. rra antigenicity was tested by t-cell proliferation and western blot analysis, and functional rel ...201121554842
identification of papain-like cysteine proteases from the bovine piroplasm babesia bigemina and evolutionary relationship of piroplasms c1 family of cysteine proteases.papain-like cysteine proteases have been shown to have essential roles in parasitic protozoa and are under study as promising drug targets. five genes were identified by sequence similarity search to be homologous to the cysteine protease family in the ongoing babesia bigemina genome sequencing project database and were compared with the annotated genes from the complete bovine piroplasm genomes of babesia bovis, theileria annulata, and theileria parva. multiple genome alignments and sequence an ...201120655912
prevalence and genetic diversity of babesia and anaplasma species in cattle in sudan.disease prevalence studies are one of the most valuable tools to demonstrate the risk or impact of certain infections in local and global economies. the data obtained in these studies contribute to develop strategies for disease control. the present study aims to provide information about the prevalence of babesiosis and anaplasmosis in the northern regions of sudan. blood samples from four different states of sudan were collected from apparently healthy cattle (n=692), dna was extracted and the ...201121612870
a campaign to eradicate bovine babesiosis from new caledonia.in december 2007, babesia bovis was introduced to new caledonia through the importation of cattle that had been vaccinated with a live tick fever (babesiosis and anaplasmosis) vaccine. although the tick rhipicephalus (boophilus) microplus is common in new caledonia, the territory had previously been free of tick-borne diseases of cattle. this paper describes the initial extent of the outbreak, the measures and rationale for disease control, and the progress to date of the eradication campaign. i ...201121771538
emerging perspectives in the research of bovine babesiosis and anaplasmosis.the babesia bovis and b. bigemina apicomplexan protozoa in conjunction with the rickettsia anaplasma marginale are intraerythrocytic pathogens that are responsible for the most prevalent and costly tick borne diseases (tbd's) of cattle worldwide. these organisms are historically associated as they can cause clinically related hemolytic diseases in cattle, are all transmitted by rhiphicephallus (boophilus) ticks, and share an uncanny ability to evade the immune systems of the vertebrate hosts, ca ...201121684084
genome-wide analysis of peptidase content and expression in a virulent and attenuated babesia bovis strain pair.identifying virulence determinants in apicomplexan parasites remains a major gap in knowledge for members within this phylum. we hypothesized that peptidases would segregate with virulence between a virulent parent babesia bovis strain and an attenuated daughter strain derived by rapid in vivo passage. using the complete genome sequence of the virulent t2bo strain, 66 peptidases were identified and active sites confirmed. the presence, sequence identity and expression levels were tested for each ...201121741414
attenuation of virulence in an apicomplexan hemoparasite results in reduced genome diversity at the population level.abstract:201121838895
serological survey of babesia bovis and babesia bigemina in cattle in south africa.a total of 719 serum samples collected from clinically healthy cattle from eight provinces located in different districts of south africa were examined by the indirect enzyme-linked immunosorbent assay (elisa) and the standard indirect fluorescent antibody test (ifat) to determine the serological prevalence of babesia bovis and babesia bigemina. the results showed that 35.3% and 39.7% of cattle were positive for b. bovis and 30% and 36.5% were positive for b. bigemina antibodies on elisa and ifa ...201121700393
nilgai antelope in northern mexico as a possible carrier for cattle fever ticks and babesia bovis and babesia bigemina.of 20 blood samples from nilgais from m+®xico, five were polymerase chain reaction-positive for babesia bigemina and one for babesia bovis. positive samples had the expected 170 (b. bigemina) and 291 (b. bovis) base pairs and were identical to gen-bank b. bigemina accession s45366 and b. bovis m38218.201121719852
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