studies of growth and development of gametocytes in haemoproteus columbae determined by their ability to exflagellate and round up, it took the macrogametocyte and the microgametocyte of haemoproteus columbae in pigeons 68 and 116 h, respectively, after patency to reach maturity. pigment granules appeared in the undifferentiated gametocytes 8 h after invasion of blood. vacuoles were observed in young gametocytes and persisted in the older forms. the growth curve of h. columbae is close to the sigmoidal curve for growth in protozoa. multiple infection was noticed in ...197899514
haemoproteus columbae: course of infection, relapse and immunity to reinfection in the pigeon.studies were performed on the course of infection, relapse, and immunity to reinfection in 11 young pigeons infected with the avian malaria parasite haemoproteus columbae kruse. the prepatent period in our experiments varied between 22 and 37 days. the intensity and length of the initial infection period showed wide variations. during this period an initial periodicity of gametocyte production of about 12 days with peaks at about 6-8 and 18-20 days after patency was observed. the various modes o ...1978104464
schizogony in haemoproteus columbae fill in some of the gaps in our knowledge of schizogony of haemoproteus columbae kruse, transmission experiments involving inoculation into pigeons (columba livia gmelin) of sporozonites from salivary glands of the hippoboscid fly pseudolynchia canariensis (macquart) were carried out. we were unable to detect prepatent schizonts or to observe schizogonic development when infection became chronic. schizonts were mainly confined to lung tissue. observations of parapatent schizonts were made in ...1977410922
seasonal occurrence of haemoproteus columbae kruse and its vector pseudolynchia canariensis bequaert.seasonal prevalence of haemoproteus columbae and its vector pseudolynchia canariensis in the feral pigeon (columba livia) population of detroit, michigan has been studied for 5 years. the greated prevalence of h. columbae infection occurs during fall and winter and is lowest during the spring, correlating with changes in the vector population.1975803576
effects of host and spatial factors on a haemoproteid community in mourning doves from western texas.two species of hematozoa, haemoproteus columbae and h. sacharovi, were observed on thin blood smears from populations of mourning doves (zenaida macroura) in the rolling plains (rp, a semiarid dryland farming and grazing area) and southern high plains (shp, an intensively cultivated and irrigated agricultural region with playa lakes) of western texas (usa). prevalences of h. columbae and h. sacharovi were 91 and 18% in doves from the rp (n = 44 doves examined) and 81 and 36% in those from thte s ...19902250318
fine structure of haemoproteus columbae kruse during differentiation of the ookinete. 19744209086
fine structure of haemoproteus columbae kruse during macrogametogenesis and fertilization. 19744209475
high voltage electron microscopy on microgametogenesis of haemoproteus columbae. 19744211271
the fine structure of differentiating merozoites of haemoproteus columbae kruse. 19714332239
observations on the fine structure of the schizonts of haemoproteus columbae kruse. 19724621522
the fine structure of haemoproteus columbae sporozoites. 19724624299
pathogenicity of haemoproteus columbae. 19724625895
an electronmicroscopic study of the microgamete of haemoproteus columbae kruse. 19724627526
the fine structure of the mature gametes of haemoproteus columbae kruse. 19684966880
the fine structure of microgametogenesis in haemoproteus columbae kruse. 19684976003
studies on parasites of african part of the studies on the parasites of wild life, forty (40) snakes caught by trapping were examined for blood and gastro-intestinal parasites. capillaria, trichomonas intestinalis, eimeria bitis, ascaris and oxyurids were the the gastro-intestinal parasites found while haemoproteus columbae was the only blood parasite found. in this investigation, parasites found in the snakes were identified as the public health importance of the disease examined.19827169310
extraction of haemoproteus columbae (haemosporina: haemoproteidae) antigen from rock dove pigeons (columba livia) and its use in an antibody elisa.erythrocytic stages of haemoproteus columbae were extracted from the cytoplasm of nucleated red blood cells (rbc) of rock dove pigeons (columba livia) using cationic detergent (n,n',n'-polyoxyethylene(10)-n-tallow-1,3-diaminopropane [edta-20]) and discontinuous percoll gradient density. crude rbc extract (crbce) antigen was prepared. parasitized rbcs were more resistant to edta-20 action than unparasitized cells. an enzyme-linked immunosorbent assay (elisa) was developed for detection of anti-h. ...19947931906
bionomics and laboratory transmission of haemoproteus columbae kruse by pseudolynchia canariensis maquart (diptera: hippoboscidae) to two bird hosts in egypt.pseudolynchia canariensis succeeded to feed and survive normally on both streptopelia senegallus and s. turtur. the feeding period, blood meal ratio and longevity of both male and female flies did not differ significantly (p > 0.05) from the corresponding values for the natural host columba livia. infection of s. senegallus with haemoproteus columbae through flies bites, injection with either infected salivary glands suspension or infected macerated lung tissue of c. livia revealed a high parasi ...19989617043
the evolution of primate malaria parasites based on the gene encoding cytochrome b from the linear mitochondrial genome.we report a phylogenetic analysis of primate malaria parasites based on the gene encoding the cytochrome b protein from the mitochondrial genome. we have studied 17 species of plasmodium, including 14 parasitic in primates. in our analysis, four species were used for rooting the plasmodium phylogenetic tree: two from closely related genera (hepatocystis sp. and haemoproteus columbae) and two other apicomplexa (toxoplasma gondii and theileria parva). we found that primate malaria parasites form a ...19989653151
therapeutic effects of some antihaematozoal drugs against haemoproteus columbae in domestic pigeons.three antihaematozoal drugs were tested for the treatment of pigeons naturally infected with haemoproteus columbae. butalex (buparvaquone) was found effective against the parasite either by using the recommended dose (r. d.) or the double (d. d.) dosis. the r. d. of berenil (diminazene aceturate) was not effective while the d. d. reduced the number of gametocytes circulating in the infected blood. triquine was found very toxic to the pigeons both the r. d. and the d. d.199910085582
haemoproteus columbae in domestic pigeons in sebele, gaborone, botswana.mature and immature stages of haemoproteus columbae gametocytes, an avian haemosporidian protozoan parasite were found in 75% of blood smears prepared from 30 healthy domestic pigeons in sebele location, gaborone, botswana. parenteral administration of an immuno-suppressive dose of dexamethasone, lowered the level of parasitaemia, the packed cell volume and the heterophil:lymphocyte ratio in the test pigeons. however, both the dexamethasone-treated and the control pigeons remained clinically nor ...199910396759
parasites of domestic pigeons (columba livia domestica) in sebele, gaborone, botswana.the following parasites were found in apparently healthy pigeons kept in sebele: a haemoprotozoan, haemoproteus columbae (80%); endoparasite metazoan nematodes, ascaridia columbae (30%) and dispharynx spiralis (10%); a cestode, raillietina sp. (80%) and coccidian oocysts (40%); 2 ectoparasites, namely the pigeon fly, pseudolynchia canariensis (50%) and the louse, columbicola columbae (30%). the pigeons also had highantibody titres, (1:256) to the protozoan parasite toxoplasma gondii (100%). the ...200011212939
haemoproteus and schistosoma synthesize heme polymers similar to plasmodium hemozoin and beta-hematin.many parasites digest hemoglobin as an amino acid source, but only a few produce heme polymer pigment instead of catabolizing heme via heme oxygenase. this work compares purified heme polymers produced by haemoproteus columbae and schistosoma mansoni to that of plasmodium falciparum hemozoin and synthetic beta-hematin. fourier-transform infrared spectroscopy identifies the signature peaks of the common iron-carboxylate bond characteristic in all four heme polymers. however, all pigments could be ...200111254949
prevalence and intensity of haemoproteus columbae in three species of wild doves from brazil.the prevalence and intensity of blood parasites in three species of wild doves were studied in the municipality of junqueirópolis, in the western region of the state of são paulo, brazil. three species of doves were surveyed: 331 specimens of zenaida auriculata des murs, 1847, 62 specimens of columbina talpacoti temminck, 1811 and 57 specimens of scardafella squammata lesson, 1831. haemoproteus columbae kruse, 1890 was found in blood from all the doves species. the prevalence of this parasite wa ...200111285493
investigation of blood parasites in livestock infested with argasid and ixodid ticks in egypt.nineteen species and subspecies of ixodid and argasid ticks, hyalomma dromedarii, h. impeltatum, h. anatolicum excavatum, h. a. anatolicum, h. truncatum, h. m. marginatum, h. m. rufipes, h. m. turanicum, boophilus annulatus, rhipicephalus sanguineus, r. turanicus, r. guilhoni, r. camicasi, amblyomma lipidum, a. marmoreum, a. vareigatum, argas persicus, a. hermanii and a. arboreus were collected from different localities in five governorates, giza, sharkia, ismailia, el beheira and sinai. hyalomm ...200111478436
characteristics of the haemoproteid community in an expanding white-winged dove population.the haemoproteid community of 171 eastern white-winged doves (zenaida asiatica asiatica) from the expanding texas population was examined using thin blood smears. during summer 1997, heart blood was taken from doves within their historical breeding range (lower rio grande valley of texas), an intermediate region (san antonio and surrounding area), and the new breeding periphery (north central to southeast texas). two species were found: haemoproteus columbae and haemoproteus sacharovi. infracomm ...200212053983
[haemoproteus columbae infection of pigeons in tunisia treated with diethylamino-4' methyl-1 butylamino-4 chloro-7 quinoline]. 195212979281
glucose consumption by haemoproteus columbae. 196113766354
transmission of haemoproteus columbae by blood inoculation and tissue transplants. 195015422368
parasites of columba livia (aves: columbiformes) in tenerife (canary islands) and their role in the conservation biology of the laurel pigeons.the prevalence and intensity of the parasites from 50 wild doves (columba livia) from the city of santa cruz de tenerife, in the island of tenerife (canary archipelago), were studied. the following ectoparasites were found in apparently healthy pigeons (prevalences are shown in percentage (%) and mean intensities with their standard deviations): the acari dermanyssus gallinae (de geer, 1778) (6, 241.0 +/- 138.9) and tinaminyssus melloi fain, 1962 (10%, 218.3 +/- 117.3); the louses, columbicola c ...200415490756
how predictable is the abundance of double gametocyte infections?it has been proposed that erythrocytes, infected by one male and one female gametocyte, enhance malaria transmission by lowering encounter time between male and female gametes once inside the mosquito vector. this may have important implications if they occur in human plasmodium infections. double gametocyte infections (dgis) have been found in plasmodium cultures, but it is thought that they are an artefact due to the artificially high crowding of cultures. here, we studied gametocyte density a ...200515940516
parasite mediated mortality and host immune response explain age-related differences in blood parasitism in important pattern in host-parasite assemblages is a higher intensity of parasites in juveniles than in adults, but the reasons for these differences remain obscure. three non-mutually exclusive hypotheses have been proposed: (1) heavily parasitized juveniles die before being recruited into the adult population ('selection' hypothesis); (2) the development of an acquired immunity by the host in front of the parasite reduces the intensity of the parasite in adult hosts ('immunity' hypothesis); ...200316228253
studies on the life-cycle of haemoproteus columbae. 194918229089
histopathology and morphology of the tissue stages of haemoproteus columbae causing mortality in columbiformes.two doves from the same aviary died following heavy infections with haemoproteus columbae. histopathological examination of various organs revealed numerous schizonts and megaloschizonts. there seemed to be two cycles of schizogony, one within the muscles and another in a wide range of tissues. the shape and size of the schizonts appeared to be a function of the site of formation. the rupture of megaloschizonts, especially in the striated muscles caused extensive fibre necrosis and the resultant ...199318670998
history of the discovery of the malaria parasites and their vectors.abstract: malaria is caused by infection with protozoan parasites belonging to the genus plasmodium transmitted by female anopheles species mosquitoes. our understanding of the malaria parasites begins in 1880 with the discovery of the parasites in the blood of malaria patients by alphonse laveran. the sexual stages in the blood were discovered by william maccallum in birds infected with a related haematozoan, haemoproteus columbae, in 1897 and the whole of the transmission cycle in culicine mos ...201020205846
a new haemoproteus species (haemosporida: haemoproteidae) from the endemic galapagos dove zenaida galapagoensis, with remarks on the parasite distribution, vectors, and molecular diagnostics.haemoproteus (haemoproteus) multipigmentatus n. sp. (haemosporida, haemoproteidae) was found in the endemic galapagos dove zenaida galapagoensis . it is described based on the morphology of its blood stages and segments of the mitochondrial cytochrome b gene, which can be used for molecular identification and diagnosis of this species. haemoproteus multipigmentatus can be readily distinguished from all species of hemoproteids of the subgenus haemoproteus , primarily due to numerous (approximatel ...201020486741
prevalence of haemoproteus columbae and trichomonas gallinae in pigeons (columba domestica) in isfahan, iran.the aim of this study was to determine the prevalence of haemoproteus columbae and trichomonas gallinae in pigeons (columba domestica) in isfahan, iran. study was done on 100 pigeons from january to june 2010 in isfahan located in south of iran. oropharyngeal swabs were taken from all birds. also blood samples were obtained from wing vein and thin smears were prepared from them. all smears were stained by giemsa and were examined by immersion. out of 100 oropharyngeal swab smears 57 (57%) were p ...201123542461
prevalence of pigeon haemosporidians and effect of infection on biochemical factors in iran.prevalence of pigeon haemosporidians and effect of infection with haemoproteus columbae on biochemical factors were investigated in 280 wild pigeons (columba livia) captured from various locations in khorasan province, in eastern of iran, between april 2008 and june 2009. infection prevalence with h. columbae and leucocytozoon was detected 50 and 2%, respectively. however, no pigeon showed infection with plasmodium. alanine aminotransferase (alt), aspartate aminotransferase (ast), and albumin we ...201123024504
the parasitic communities of the rock pigeon columba livia from iraq: component and importance.the main objectives of the present study were to investigate the rock pigeon parasitic communities from iraq as well as reporting on the prevalence and intensity of various infections from both sexes.201223339946
avian haemosporidians from neotropical highlands: evidence from morphological and molecular data.avian haemosporidian parasites have been scarcely studied in the neotropical highlands despite the high avian diversity reported and the uniqueness of these ecosystems. the aims of this study were to examine haemoproteus and plasmodium diversity based on morphological and molecular data, as well as to explore the concordance between these two approaches, when identifying species. we sampled 1487 birds belonging to 166 species, in localities of the colombian andean region at elevations ranging fr ...201525638289
pseudomalaria in a domestic pigeon: a case report.microscopic examination of thin blood smear of a domestic pigeon brought to teaching veterinary clinical complex, junagadh, gujarat revealed mature and immature halter shaped gametocytes of haemoproteus columbae encircling the nucleated erythrocytes. the disease was diagnosed as acute infection of pigeon malaria more notably known as pseudomalaria. the parasitic infection was further confirmed by polymerase chain reaction assay targeting the cytochrome b (cyt b) gene fragment amplifying 207 base ...201728316429
effect of haemoproteus columbae infection on the hemogram of the pigeons (columba livia domestica).it has been reported that parasites affect the health and productivity of birds, initiate excessive preening which interrupts feeding, as the birds spend much time preening rather than being involved in other essential life activities. haemoproteuscolumbae occurs in pigeons widely in tropical and subtropical regions. the present investigation was concentrated on the effect of h. columbae infection on the hemogram and changes in the number of white blood cells in infected pigeons. blood samples t ...201627876958
a first report of infestation by pseudolynchia canariensis in a herd of pigeons in shahrekord (southwest of iran).pigeons (columba livia) have been kept as pet and reared for food in several countries including iran. ectoparasites are regarded as the basic causes of retardation in growth, lowered vitality and poor conditions of the birds. pseudolynchia canariensis a hippoboscidae fly is one of the important ectoparasites of pigeons and is responsible for the transmission of pathogens to birds and humans same as pathogenic protozoan haemoproteus columbae.201627308301
hemosporidian parasites of free-living birds in the são paulo zoo, brazil.numerous studies addressed the diversity of bird plasmodium and haemoproteus parasites. however, a few have been carried out in continental avian hotspot regions such as brazil, a country with markedly different biomes, including amazon, brazilian savanna, atlantic forest, caatinga, pantanal, and pampas. we present the first study on hemosporidian (haemosporida) parasites in free-living birds from an atlantic forest fragment where more than 80 avian species have been reported. within this area, ...201626677094
incidence of haemoproteus columbae in pigeons of jammu district.haemoproteus columbae is the major protozoan infection reported in pigeon and appeared in the erythrocyte of the peripheral circulation. incidence and parasitaemia of h. columbae in pigeon was studied in different localities of jammu, india for a period from april to september 2010 using thin blood smear examination. of the 150 pigeons (wild: 70, domestic: 80), 92 (61.33 %) were found to be infected with h. columbae. domestic pigeon showed higher incidence rate (74.28 %) than the wild (50 %). ma ...201526345046
in vitro development of haemoproteus columbae (haemosporida: haemoproteidae), with perspectives for genomic studies of avian haemosporidian parasites.the evolutionary origin of wildlife and human malaria parasites (plasmodium spp.) has been discussed for several decades. the lack of genomic data about species of wildlife haemosporidian parasites related to plasmodium limits the number of taxa available for phylogenetic analysis. genomic data about avian parasites of the genus haemoproteus parasites, the sister genus to plasmodium are still not available, mainly due to difficulties in obtaining pure dna of parasites inhabiting nucleated avian ...201526297677
an experimental test of the effects of behavioral and immunological defenses against vectors: do they interact to protect birds from blood parasites?blood-feeding arthropods can harm their hosts in many ways, such as through direct tissue damage and anemia, but also by distracting hosts from foraging or watching for predators. blood-borne pathogens transmitted by arthropods can further harm the host. thus, effective behavioral and immunological defenses against blood-feeding arthropods may provide important fitness advantages to hosts if they reduce bites, and in systems involving pathogen transmission, if they lower pathogen transmission ra ...201424620737
prevalence and rate of parasitemia of haemoproteus columbae in columba iiviadomesticain southwest of iran.parasites affect the health and productivity of birds. haemoproteus columbae occurs in pigeons widely in tropical and subtropical regions. the present investigation was concentrated on the prevalence of h. columbae and rate of parasitemia in domestic pigeons in southwest of iran.201325516748
sex-specific effects of an avian malaria parasite on an insect vector: support for the resource limitation hypothesis.many parasites, such as those that cause malaria, depend on an insect vector for transmission between vertebrate hosts. theory predicts that parasites should have little or no effect on the transmission ability of vectors, e.g., parasites should not reduce vector life span as this will limit the temporal window of opportunity for transmission. however, if the parasite and vector compete for limited resources, there may be an unavoidable physiological cost to the vector (resource limitation hypot ...201223236915
how do seasonality and host traits influence the distribution patterns of parasites on juveniles and adults of columba livia?parasites may influence host fitness and consequently exert a selective pressure on distinct phenotypes of the host population. this pressure can result in an evolutionary response, maintaining only individuals with certain traits in the population. the present study was aimed at identifying the morphological characteristics of juveniles and adults of columba livia that may influence the distribution patterns of lice, pseudolynchia canariensis and haemoproteus columbae and how the populations of ...201728859962
buparvaquone therapy in a rock pigeon infected with haemoproteus columbae showing torticollis.a clinical haemoproteus columbae infection in a two months rock pigeon was diagnosed on the basis of outward signs and blood smear examination. the clinical signs suggestive of pigeon malaria were anorexia, depression, inability to fly, circling movements and episodes of torticollis. the characteristic halter shaped gametocytes were seen, in thin blood smear, encircling the nucleus of erythrocytes. buparvaquone therapy, two intramuscular injections at the rate of 5 mg/kg at 72 h interval, was su ...201728615870
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