Publications

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larval feeding performance of two neotropical ornithodoros ticks (acari: argasidae) on reptiles.this paper determines the feeding performance of the larvae of two neotropical soft tick species namely ornithodoros rostratus aragão, 1911 and o. puertoricensis fox, 1947 on reptiles (gekkonidae) using rabbits, mice and guinea pigs to provide comparisons with feeding features on mammals. o. puertoricensis produced a larval feeding rate of 63% on reptiles, while that of o. rostratus was only 20%. but the final success (attaching + feeding) was similar, 12.4% for o. puertoricensis and 10.4% for o ...200616858631
spatial distribution and impact of cattle-raising on ticks in the pantanal region of brazil by using the co(2) tick trap.this study evaluates the impact of cattle-raising on ticks associated with wildlife in the pantanal region of brazil, by trapping free-living ticks using a co(2) tick trap. the traps were equally distributed in two areas: a 600-ha protected area (pa) and the nhumirim ranch (nr). both areas are contiguous and located at the sub-region of nhecolândia (18 degrees 59's; 56 degrees 39'w), pantanal, brazil. in each area, four habitat types were selected: cerrado (tropical savanna), forest patches, lak ...200818454288
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
coxiella detection in ticks from wildlife and livestock in malaysia.recent studies have shown that ticks harbor coxiella-like bacteria, which are potentially tick-specific endosymbionts. we recently described the detection of coxiella-like bacteria and possibly coxiella burnetii in ticks found from rural areas in malaysia. in the present study, we collected ticks, including haemaphysalis bispinosa, haemaphysalis hystricis, dermacentor compactus, dermacentor steini, and amblyomma sp. from wildlife and domesticated goats from four different locations in malaysia. ...201627763821
the recent evolution of a maternally-inherited endosymbiont of ticks led to the emergence of the q fever pathogen, coxiella burnetii.q fever is a highly infectious disease with a worldwide distribution. its causative agent, the intracellular bacterium coxiella burnetii, infects a variety of vertebrate species, including humans. its evolutionary origin remains almost entirely unknown and uncertainty persists regarding the identity and lifestyle of its ancestors. a few tick species were recently found to harbor maternally-inherited coxiella-like organisms engaged in symbiotic interactions, but their relationships to the q fever ...201525978383
update on tick-borne rickettsioses around the world: a geographic approach.tick-borne rickettsioses are caused by obligate intracellular bacteria belonging to the spotted fever group of the genus rickettsia. these zoonoses are among the oldest known vector-borne diseases. however, in the past 25 years, the scope and importance of the recognized tick-associated rickettsial pathogens have increased dramatically, making this complex of diseases an ideal paradigm for the understanding of emerging and reemerging infections. several species of tick-borne rickettsiae that wer ...024092850
dogs, cats, parasites, and humans in brazil: opening the black box.dogs and cats in brazil serve as primary hosts for a considerable number of parasites, which may affect their health and wellbeing. these may include endoparasites (e.g., protozoa, cestodes, trematodes, and nematodes) and ectoparasites (i.e., fleas, lice, mites, and ticks). while some dog and cat parasites are highly host-specific (e.g., aelurostrongylus abstrusus and felicola subrostratus for cats, and angiostrongylus vasorum and trichodectes canis for dogs), others may easily switch to other h ...201424423244
host-parasite relationship of ticks (acari: ixodidae and argasidae) and feral pigs (sus scrofa) in the nhecolândia region of the pantanal wetlands in mato grosso do sul.feral pigs (s. scrofa) were introduced to the pantanal region around 200 years ago and the population appears to be in expansion. its eradication is considered to be impossible. the population of feral pigs in the pantanal wetlands is currently estimated at one million. two scientific excursions were organized. the first was conducted during the dry season, when 21 feral pigs were captured and the second was during the wet season, when 23 feral pigs were captured. ticks were collected and the ov ...201327335855
molecular characterization of a defensin gene from a hard tick, dermacentor silvarum.ticks are distributed worldwide and considered as vectors of many human diseases. tick defensins, a family of antimicrobial peptides, form the first line of defense against pathogens.201525588982
molecular methods routinely used to detect coxiella burnetii in ticks cross-react with coxiella-like bacteria.q fever is a widespread zoonotic disease caused by coxiella burnetii. ticks may act as vectors, and many epidemiological studies aim to assess c. burnetii prevalence in ticks. because ticks may also be infected with coxiella-like bacteria, screening tools that differentiate between c. burnetii and coxiella-like bacteria are essential.201526609691
physiological characterization of the hematophagy of ornithodoros rostratus (acari: argasidae) on live hosts.ornithodoros rostratus is an argasid tick and its importance is based on its hematophagy and the resulting transmission of pathogens such as rickettsia rickettsii and coxiella burnetii to its vertebrate hosts. in the face of a lack of physiological studies related to hematophagy in argasid ticks, this paper aims to identify and characterize the events that occur throughout the feeding by o. rostratus on live hosts. electrical signals and alterations on the feeding site were monitored using intra ...201627625415
coxiella symbiont in the tick ornithodoros rostratus (acari: argasidae).in the present study, the presence of tick-associated bacteria and protozoa in ornithodoros rostratus ticks (adults, nymphs, and eggs) from the pantanal region of brazil were determined by molecular detection. in these ticks, dna from protozoa in the genera babesia and hepatozoon, and bacteria from the genera rickettsia, borrelia, anaplasma, and ehrlichia were not detected. conversely, all tested ticks (100%) yielded pcr products for 3 coxiella genes (16s rrna, pyrg, cap). pcr and phylogenetic a ...201222480930
comparative analysis of spermatids of rhipicephalus sanguineus sensu lato (ixodidae) and ornithodoros rostratus ticks (argasidae): morphophysiology aimed at systematics.the phylogenetic relationships among tick species (acari: ixodida) have been revisited by several researchers over the last decades. two subfamilies, rhipicephalinae (ixodidae) and ornithodorinae (argasidae), deserve special attention. the male reproductive system morphology, as well as the ultrastructure of the germ cells, may provide important information for phylogeny and systematics of metazoan groups, with spermatozoa exhibiting characters that can be used for this purpose. with that inform ...201626481487
life cycle of ornithodoros rostratus (acari: argasidae) ticks feeding on mice under laboratory conditions.ornithodoros rostratus aragão is an argasid tick found in bolivia, paraguay, argentina and brazil. only limited studies about o. rostratus have been conducted and several aspects of their life cycle differ among studies or remain unexplored. in order to better elucidate the biology of o. rostratus, the present work describes its life cycle when feeding on mice under laboratory conditions. to complete their life cycle on mice, o. rostratus goes through a larval stage, 3-6 nymphal instars (nymph 1 ...201525717006
life cycle of ornithodoros rostratus (acari: argasidae) under experimental conditions and comments on the host-parasite relationship in the pantanal wetland region, brazil.the genus ornithodoros is represented by 15 species in brazil, on which no detailed life cycle studies have been published, except for o. talaje and o. mimon. the aim of the present study was to evaluate life cycle parameters of o. rostratus based on ticks collected in the pantanal wetland region of the state of mato grosso do sul, brazil, using domestic rabbits as experimental hosts. the periods of pre-attachment and feeding of the larvae lasted an average of 39 min (range 15-76 min). five or s ...201323456605
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