Publications

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first description of the male and redescription of the immature stages of amblyomma rotundatum (acari: ixodidae), a recently discovered tick in the u.s.a.the male of amblyomma rotundatum is described for the first time, and the nymph and larva are redescribed. this tick is a parthenogenetically reproducing species parasitic on amphibians and reptiles in the warmer areas of the new world. attempts to mate male and female a. rotundatum under laboratory conditions were unsuccessful.19938277377
establishment of the foreign partheonogenetic tick amblyomma rotundatum (acari: ixodidae) in florida.the parthenogenetic tick amblyomma rotundatum, a central and south american species, has become established in southern florida. the date of introduction is unknown, but it is suspected to be either during the 1930s, when 1 of its natural hosts, the giant or marine toad, bufo marinus, was introduced to southern florida as a potential biological control of pest beetles in sugar cane fields, or between 1955 and 1964 when specimens of b. marinus were accidentally or deliberately released in the gre ...19938410557
genetic markers for the identification of two tick species, amblyomma dissimile and amblyomma rotundatum.genetic markers are described for 2 species of reptile and amphibian ticks, amblyomma dissimile and amblyomma rotundatum, by allozyme electrophoresis. fixed allelic differences in 4 out of the 8 examined loci allowed the unequivocal separation of both of these species. a strong correlation was found between these genetic markers and the relative size of the spurs in coxae iv but not with the punctuation pattern of the scutum. moreover, no overlap was found in the distribution of relative spur si ...19979194816
report on ticks collected in the southeast and mid-west regions of brazil: analyzing the potential transmission of tick-borne pathogens to man.specimens of ticks were collected in 1993, 1996, 1997, and 1998, mostly from wild and domestic animals in the southeast and mid-west regions of brazil. nine species of amblyommidae were identified: anocentor nitens, amblyomma cajennense, amblyomma ovale, amblyomma fulvum, amblyomma striatum, amblyomma rotundatum, boophilus microplus, boophilus annulatus, and rhipicephalus sanguineus. the potential of these tick species as transmitters of pathogens to man was analyzed. a flaviviridade flavivirus ...199910881097
rickettsia bellii and rickettsia amblyommii in amblyomma ticks from the state of rondônia, western amazon, brazil.this study evaluates the rickettsial presence in amblyomma ticks from eight areas of the amazon forest in rondônia, brazil. the following tick species (number in parentheses) were examined: amblyomma ovale koch (121), amblyomma cajennense (f.) (41), amblyomma naponense (packard) (36), amblyomma scalpturatum neumann (35), amblyomma oblongoguttatum koch (30), amblyomma incisum neumann (27), amblyomma rotundatum koch (16), amblyomma coelebs neumann (10), and amblyomma humerale koch (6). ticks were ...200415605647
first report of the male of amblyomma rotundatum (acari: ixodidae) from a field-collected host.an adult male of the tick amblyomma rotundatum koch was collected on a naturally infested lizard, tropidurus sp. (squamata: tropiduridae), at monte negro, state of rondonia, brazil. the tick's identity was confirmed morphologically and by analysis of the second internal transcribed spacer of the ribosomal dna. this is the third known male specimen of a. rotundatum, a species that has been shown to reproduce exclusively by parthenogenesis. the two previously reported male specimens seemed to be p ...200516465732
importation of exotic ticks into the united kingdom via the international trade in reptiles.due to the increased trade in exotic reptiles, many of which are infested with ticks of various genera, there is an increased risk of exotic ticks and pathogens being introduced and potentially becoming established in new geographical areas. despite the number and variety of tick species collected from reptiles, their role in the maintenance of pathogens and transmission to humans has not been fully investigated for all species. the potential public health risks to the united kingdom have been e ...200616550335
the emerging diversity of rickettsia.the best-known members of the bacterial genus rickettsia are associates of blood-feeding arthropods that are pathogenic when transmitted to vertebrates. these species include the agents of acute human disease such as typhus and rocky mountain spotted fever. however, many other rickettsia have been uncovered in recent surveys of bacteria associated with arthropods and other invertebrates; the hosts of these bacteria have no relationship with vertebrates. it is therefore perhaps more appropriate t ...200616901827
isolation of rickettsia rhipicephali and rickettsia bellii from haemaphysalis juxtakochi ticks in the state of são paulo, brazil.in the present study, attempts to isolate rickettsia in cell culture were performed individually in seven specimens of haemaphysalis juxtakochi ticks collected in the state of são paulo (southeastern brazil). rickettsia was successfully isolated by the shell vial technique and established in vero cell culture from six ticks (six isolates). dna extracted from infected cells of these isolates was tested by pcr and dna sequencing, using genus-specific rickettsia primers targeting the genes glta, ht ...200717142361
tick paralysis of a snake caused by amblyomma rotundatum (acari: ixodidae).a lethargic southern black racer, coluber constrictor priapus dunn and wood, wild-caught in the florida keys, monroe county, fl, was found to be paralyzed by the bite of a female ixodid tick, amblyomma rotundatum koch (acari: ixodidae). removal of the tick restored the snake to normalcy within 18 h. other, earlier reported cases of tick toxicosis in reptiles are reviewed and clarified. evidently, the present incident is the only reported case of tick paralysis in a poikilotherm found in a natura ...200717294934
tick fauna from two locations in the brazilian savannah.the cerrado is brazil's tropical savannah, which is arguably under greater threat than the amazon rainforest. the cerrado biome of tropical south america covers about 2 million km(2) and is considered a biodiversity hot spot which means that it is especially rich in endemic species and particularly threatened by human activities. the cerrado is increasingly exposed to agricultural activities which enhance the likelihood of mixing parasites from rural, urban and wildlife areas. information about ...200717828441
hyperparasitism in amblyomma rotundatum (acari: ixodidae).in the present study, we report a case of hyperparasitism in amblyomma rotundatum. during examination of live ticks immediately after collecting them from boa constrictor snakes held in a reptile facility in mossoró, rn, northeastern brazil, 1 unengorged tick female was seen attached to the venter of a partially engorged female. the hypostome and chelicerae of the unengorged female had penetrated the integument of the partially engorged female to the level of the basis capitulli and the palps we ...200718314708
ticks, amblyomma rotundatum (acari: ixodidae), on toads, chaunus schneideri and chaunus granulosus (anura: bufonidae), in northern argentina.this communication provides notes on 2 species of toads, chaunus schneideri and chaunus granulosus, infested with ixodid ticks, amblyomma rotundatum, from the provinces of corrientes and formosa in northern argentina. chaunus schneideri is a new amphibian host record for a. rotundatum, a species previously reported to parasitize other anurans and also reptiles. we examined 74 ticks on 5 toads. all ticks were a. rotundatum; all adults were females, and all developmental stages were randomly attac ...200818564766
[not available]. 194818908105
ticks infesting amphibians and reptiles in pernambuco, northeastern brazil.ticks infesting amphibians and reptiles in the state of pernambuco are reviewed, based on the current literature and new collections recently carried out by the authors. to date, three tick species have been found on amphibians and reptiles in pernambuco. amblyomma fuscum appears to be exclusively associated with boa constrictor, its type host. amblyomma rotundatum has a relatively low host-specificity, being found on toads, snakes, and iguana. amblyomma dissimile has been found on a lizard and ...200819265581
ticks on captive and free-living wild animals in northeastern brazil.from 2005 to 2009, 147 ticks found on 32 wild animals from or referred to two zoobotanical parks (parque zoobotânico arruda câmara and parque estadual dois irmãos) located in northeastern brazil were identified. ticks found on two veterinarians working in one of the parks (i.e., parque estadual dois irmãos), after return from forested areas within the park's territory, were also identified. the following tick-host associations were recorded: amblyomma fuscum neumann on boa constrictor l.; amblyo ...201019693679
amblyomma rotundatum (koch, 1844) (acari: ixodidae) two-host life-cycle on viperidae snakes.amblyomma rotundatum is an ixodid tick that infests ectothermic animals and reproduces exclusively by parthenogenesis. this tick has been frequently reported to infest reptiles and amphibians, under natural conditions and sometimes in captivity. it was described in brazil and several other countries of south, central and north america. although many studies have reported aspects of its biology, none of them has used regularly either ophidian as hosts, or controlled temperature, humidity and lumi ...201020943022
new tick records in rondônia, western brazilian amazon.in the present study, we provide new tick records from vilhena municipality, in the southeast of the state of rondônia, northern brazil. ticks collected from a capybara, hydrochoerus hydrochaeris (linnaeus), were identified as amblyomma romitii tonelli-rondelli (1 female), and amblyomma sp. (1 larva). ticks collected from a harpy eagle, harpia harpyja (linnaeus), were identified as amblyomma cajennense (fabricius) (16 nymphs) and haemaphysalis juxtakochi cooley (1 nymph). ticks collected from a ...201020943027
ticks infesting wildlife species in northeastern brazil with new host and locality records.from september 2008 to march 2010, 397 ticks (315 larvae, 33 nymphs, 23 females, and 26 males) were collected from captive and free-living wildlife species in northeastern brazil. six tick species were identified, including amblyomma auricularium (conil) on tamandua tetradactyla (l.), amblyomma dubitatum neumann on hydrochaeris hydrochaeris (l.), nectomys rattus (pelzen) and t. tetradactyla, amblyomma parvum aragão on t. tetradactyla, amblyomma rotundatum koch on boa constrictor l., chelonoidis ...201021175080
first reports of ectoparasites collected from wild-caught exotic reptiles in florida.we collected ectoparasites from 27 of 51 wild-caught, free-ranging exotic reptiles examined in florida from 2003 to 2008. sampled animals represented eight species, five of which yielded ectoparasites. reported new parasite distribution records for the united states include the following: the first collection of the african tick amblyomma latum (koch) from a wild-caught animal [ball python, python regius (shaw)] in the united states; the first collection of the lizard scale mite hirstiella stami ...201121337954
rickettsia bellii infecting amblyomma sabanerae ticks in el salvador.four amblyomma sabanerae ticks collected from a turtle (kinosternon sp.) in san miguel, el salvador, were found by molecular analysis to be infected by rickettsia bellii. we provide the first report of rickettsia bellii in central america, and the first report of a rickettsia species in el salvador.201223265378
prevalence and burden of two rickettsial phylotypes (g021 and g022) in ixodes pacificus from california by real-time quantitative pcr.the western black-legged tick, ixodes pacificus cooley and kohls, commonly bites humans in the far western u.s. in addition to transmitting lyme borreliosis and anaplasmosis, it is a host of nonpathogenic bacteria as well as some of unknown pathogenicity. in this study, we report the detection, prevalence, and burden of 2 rickettsial phylotypes with unknown pathogenicity in i. pacificus ticks from 6 california counties using real-time quantitative pcr with phylotype-specific primers and probes. ...201323522936
tick-borne infections in human and animal population worldwide.the abundance and activity of ectoparasites and its hosts are affected by various abiotic factors, such as climate and other organisms (predators, pathogens and competitors) presenting thus multiples forms of association (obligate to facultative, permanent to intermittent and superficial to subcutaneous) developed during long co-evolving processes. ticks are ectoparasites widespread globally and its eco epidemiology are closely related to the environmental conditions. they are obligatory hematop ...201527047089
effects of the diet on the microbiota of the red palm weevil (coleoptera: dryophthoridae).rhynchophorus ferrugineus, also known as the red palm weevil, is regarded as the major pest of palm trees. although studies of the microbiota associated with this species have been performed in recent years, little attention has been dedicated to the influence of the diet in shaping the host bacterial community. here, we investigated the influence of food sources (i.e. palm tissues vs apple based substrate) on the microbial diversity associated with rpw, which was compared with the microbiota as ...201525635833
flying ticks: anciently evolved associations that constitute a risk of infectious disease spread.ticks are important vectors of emerging zoonotic diseases affecting human and animal health worldwide. ticks are often found on wild birds, which have been long recognized as a potential risk factor for dissemination of ticks and tick-borne pathogens (tbp), thus raising societal concerns and prompting research into their biology and ecology. to fully understand the role of birds in disseminating some ticks species and tbp, it is important to consider the evolutionary relationships between birds, ...201526467109
detection of rickettsia and ehrlichia spp. in ticks associated with exotic reptiles and amphibians imported into japan.one of the major routes of transmission of rickettsial and ehrlichial diseases is via ticks that infest numerous host species, including humans. besides mammals, reptiles and amphibians also carry ticks that may harbor rickettsia and ehrlichia strains that are pathogenic to humans. furthermore, reptiles and amphibians are exempt from quarantine in japan, thus facilitating the entry of parasites and pathogens to the country through import. accordingly, in the current study, we examined the presen ...201526207382
tick-box for 3'-end formation of mitochondrial transcripts in ixodida, basal chelicerates and drosophila.according to the trna punctuation model, the mitochondrial genome (mtdna) of mammals and arthropods is transcribed as large polycistronic precursors that are maturated by endonucleolytic cleavage at trna borders and rna polyadenylation. starting from the newly sequenced mtdna of ixodes ricinus and using a combination of mitogenomics and transcriptional analyses, we found that in all currently-sequenced tick lineages (prostriata, metastriata and argasidae) the 3'-end of the polyadenylated nad1 an ...201223077630
ticks and rickettsiae from wildlife in belize, central america.the agents of spotted fevers in latin america are rickettsia rickettsii, r. parkeri, rickettsia sp. strain atlantic rainforest, and r. massiliae. in continental central america, r. rickettsii remains the only known pathogenic tick-borne rickettsia. in the present study, ticks were collected from wild mammals in natural areas of belize. besides providing new data of ticks from belize, we investigated rickettsial infection in some of these ticks. our results provide ticks harboring rickettsial age ...201626831147
redescription, molecular characterisation and taxonomic re-evaluation of a unique african monitor lizard haemogregarine karyolysus paradoxa (dias, 1954) n. comb. (karyolysidae).within the african monitor lizard family varanidae, two haemogregarine genera have been reported. these comprise five species of hepatozoon miller, 1908 and a species of haemogregarina danilewsky, 1885. even though other haemogregarine genera such as hemolivia petit, landau, baccam & lainson, 1990 and karyolysus labbé, 1894 have been reported parasitising other lizard families, these have not been found infecting the varanidae. the genus karyolysus has to date been formally described and named o ...201627305899
proteomic screening of antigenic proteins from the hard tick, haemaphysalis longicornis (acari: ixodidae).proteomic tools allow large-scale, high-throughput analyses for the detection, identification, and functional investigation of proteome. for detection of antigens from haemaphysalis longicornis, 1-dimensional electrophoresis (1-de) quantitative immunoblotting technique combined with 2-dimensional electrophoresis (2-de) immunoblotting was used for whole body proteins from unfed and partially fed female ticks. reactivity bands and 2-de immunoblotting were performed following 2-de electrophoresis t ...201525748713
rickettsia bellii in amblyomma rotundatum ticks parasitizing rhinella jimi from northeastern brazil.this study evaluated rickettsial infection in amblyomma rotundatum ticks collected from toads (rhinella jimi) in the brazilian caatinga biome, an unique semiarid region of south america. tick infestations were observed in 57.8% toads (26/45); mean infestation: 1.6 ticks/toad. dna extraction from 42 ticks (6 larvae, 22 nymphs and 11 female adults) was tested by polymerase chain reaction (pcr) targeting rickettsia organisms, which were detected in 100% of the ticks. amplicons' dna sequences were i ...201626344601
molecular detection of rickettsia bellii in amblyomma rotundatum from imported red-footed tortoise (chelonoides carbonaria).introduction of exotic ticks and pathogens through international animal trade (farm animals and pets) is a serious threat to public health and local fauna. rapid and correct identification of potential threats is an important step on the way to conduct an efficient control of imported pests. in this report we describe the molecular identification of the neotropic tick amblyomma rotundatum intercepted from red-footed tortoise (chelonoides carbonaria), imported to israel from florida, usa. molecul ...201525865033
rickettsial infection in animals, humans and ticks in paulicéia, brazil.a previous study in paulicéia municipality, south-eastern brazil, reported 9.7% of the amblyomma triste ticks to be infected by rickettsia parkeri, a bacterial pathogen that causes spotted fever in humans. these a. triste ticks were shown to be associated with marsh areas, where the marsh deer blastocerus dichotomus is a primary host for this tick species. during 2008-2009, blood serum samples were collected from 140 horses, 41 dogs, 5 opossums (didelphis albiventris) and 26 humans in farms from ...201525643912
reptile-associated ticks from dominica and the bahamas with notes on hyperparasitic erythraeid mites.ticks were collected or recorded from 522 individual reptiles on dominica and from 658 reptiles from the bahamas. two species of ticks were collected on dominica: amblyomma antillorum and amblyomma rotundatum. similarly, 2 species were collected in the bahamas: amblyomma albopictum and amblyomma torrei. on dominica, a. antillorum was recorded from 517 lesser antillean iguanas (iguana delicatissima), 2 boa constrictors (boa nebulosa), 1 antilles snake (alsophis sibonius), and 1 dominican ground l ...201525274575
new tick records from the state of rondônia, western amazon, brazil.from 2005 to 2012, ticks were collected from different hosts at different localities of the state of rondônia. the following 16 ixodid tick species were identified: ixodes fuscipes, amblyomma auricularium, amblyomma coelebs, amblyomma dubitatum, amblyomma geayi, amblyomma humerale, amblyomma latepunctatum, amblyomma longirostre, amblyomma naponense, amblyomma nodosum, amblyomma oblongoguttatum, amblyomma ovale, amblyomma romitii, amblyomma rotundatum, amblyomma scalpturatum, and amblyomma varium ...201423975565
new records of amblyomma goeldii (acari: ixodidae) and description of the nymphal stage.since its original description from the amazonian region, the tick species amblyomma goeldii neumann, 1899 has been misidentified with amblyomma rotundatum koch, 1844 in different countries of the neotropical region. because of this, some authors have considered that the only confirmed records of a. goeldii were from french guyana. herein, we reviewed all specimens of a. goeldii that have been deposited at two tick collections in brazil. in addition, we describe the nymphal stage of a. goeldii f ...201525947818
morphological and molecular identification of ticks infesting boa constrictor (squamata, boidae) in manaus (central brazilian amazon).the boa constrictor is one of the world's largest vertebrate carnivores and is often found in urban areas in the city of manaus, brazil. the morphological identification of ticks collected from 27 snakes indicated the occurrence of amblyomma dissimile koch 1844 on all individuals sampled. in contrast, amblyomma rotundatum koch was found on only two snakes. an analysis of the 16s rrna molecular marker confirmed the morphological identification of these ectoparasites.201725517537
first report of exotic ticks (amblyomma rotundatum) parasitizing invasive cane toads (rhinella marina) on the island of hawai'i.our surveys of 1401 invasive cane toads (rhinella marina) from the hawaiian islands of hawai'i, o'ahu, and maui revealed the presence of an exotic tick, amblyomma rotundatum. immature and adult female ticks infested three wild adult toads at a single site in the vicinity of a zoo south of hilo, island of hawai'i, hawai'i, usa. we found no tick-infested toads on o'ahu or maui. this tick infests cane toads in their native neotropical range, but it was excluded from hawai'i when the original founde ...201728017622
life cycle and behavior of amblyomma rotundatum (acari: ixodidae) under laboratory conditions and remarks on parasitism of toads in brazil.the life cycle and behavior of amblyomma rotundatum were evaluated under laboratory conditions. the experiment started with four engorged females collected from toads (rhinella schneideri) naturally infested at the pirapitinga ecological station in the state of minas gerais, brazil. developmental periods of free-living stages were assessed in an incubator at 27 ± 1 °c, >80 % rh and darkness. the complete life cycle, including pre-attachment periods for each parasitic stage, ranged from 126 to 22 ...201323100108
new host records for amblyomma rotundatum (acari: ixodidae) from grussaí restinga, rio de janeiro, brazil.amblyomma rotundatum koch is a parthenogenetic tick usually associated with reptiles and amphibians. however, relatively few studies on occurrences of ticks in wild reptile populations in brazil have been produced. the aim of this study was to analyze the presence of ticks associated with reptile species in the grussaí restinga, in the municipality of são joão da barra, state of rio de janeiro, brazil. between december 2010 and january 2011, 131 individuals belonging to nine species of reptiles ...201223070450
morphological records of oocyte maturation in the parthenogenetic tick amblyomma rotundatum koch, 1844 (acari: ixodidae).oocyte maturation in the thelytokous parthenogenetic tick amblyomma rotundatum was examined for the first time using light and scanning electron microscopy. the panoistic ovary lacks nurse and follicular cells and is a single continuous tubular structure forming a lumen delimited by the ovarian wall. oocytes of tick species are usually classified according to cytoplasm appearance, the presence of germinal vesicle, the presence of yolk granules, and the chorion. however, for this species, we also ...201222309861
rickettsia amblyommatis infecting ticks and exposure of domestic dogs to rickettsia spp. in an amazon-cerrado transition region of northeastern brazil.this study was performed in maranhão state, a transition area two brazilian biomes, amazon and cerrado. during 2011-2013, 1,560 domestic dogs were sampled for collection of serum blood samples and ticks in eight counties (3 within the amazon and 5 within the cerrado). a total of 959 ticks were collected on 150 dogs (9.6%). rhipicephalus sanguineus sensu lato (s.l.) was the most abundant tick (68% of all collected specimens), followed by amblyomma cajennense sensu lato (s.l.) (12.9%), amblyomma p ...201728594882
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