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rickettsia sp. strain nod infecting ticks ( amblyomma nodosum) in an endemic area of spotted fever in brazil.amblyomma nodosum ticks were collected from one collared anteater ( tamandua tetradactyla) in the caatinga biome, brazil. from one sample, we isolated a rickettsia sp. that was phylogenetically close to rickettsia sp. strain nod, with 99.9, 100.0, and 99.8% identity for glta, htra, and ompa genes, respectively.201729261444
molecular detection of rickettsia rhipicephali and other spotted fever group rickettsia species in amblyomma ticks infesting wild birds in the state of minas gerais, brazil.the current study evaluated parasitism of wild birds by ticks in a fragment of atlantic forest in the state of minas gerais, brazil, and examined the ticks for rickettsial agents. birds were captured during 2014 and 2015 and ticks were identified by sequencing fragments of the 16s and 12s ribosomal dna. among 260 birds representing 19 families and 52 species, a total of 69 (26.5%) were found to be infested by larvae (ll) and/or nymphs (nn) of amblyomma longirostre (koch, 1844) (45 ll, 4 nn), amb ...201727745888
host specificity in a diverse neotropical tick community: an assessment using quantitative network analysis and host phylogeny.host specificity is a fundamental determinant of tick population and pathogen transmission dynamics, and therefore has important implications for human health. tick host specificity is expected to be particularly high in the tropics, where communities of ticks, hosts and pathogens are most diverse. yet the degree to which tropical tick species are host-specific remains poorly understood. combining new field data with published records, we assessed the specificity of tick-host associations in pan ...201627357506
questing amblyomma mixtum and haemaphysalis juxtakochi (acari: ixodidae) infected with candidatus "rickettsia amblyommii" from the natural environment in panama canal basin, panama.this work emphasizes the detection of candidatus "rickettsia amblyommii" in questing haemaphysalis juxtakochi and amblyomma mixtum. from february 2009 to december 2012, questing ticks were collected from the vegetation and leaf-litter of four protected forests and two grassy areas around the panama canal basin. dna was extracted from amblyomma mixtum, amblyomma naponense, amblyomma oblongoguttatum, amblyomma pecarium, amblyomma tapirellum, haemaphysalis juxtakochi, and unidentified immature ambl ...201526865823
rickettsial infection in ticks (acari: ixodidae) of wild animals in midwestern brazil.ticks collected in the last two decades from free-living and captive wild animals from 28 municipalities of the brazilian state of mato grosso were identified and tested using molecular methods for the presence of rickettsial agents. a total of 4467 ticks (229 larvae, 1676 nymphs, 1565 males, 997 females) representing 27 ixodid species were collected from 235 species of amphibians, reptiles, birds, and mammals from three different ecoregions (pantanal, cerrado, and amazonia). the species amblyom ...201626775021
avian migrants facilitate invasions of neotropical ticks and tick-borne pathogens into the united states.migratory birds have the potential to transport exotic vectors and pathogens of human and animal health importance across vast distances. we systematically examined birds that recently migrated to the united states from the neotropics for ticks. we screened both ticks and birds for tick-borne pathogens, including rickettsia species and borrelia burgdorferi. over two spring seasons (2013 and 2014), 3.56% of birds (n = 3,844) representing 42.35% of the species examined (n = 85) were infested by ti ...201526431964
amblyomma nodosum (neumann, 1899): observations on life cycle under laboratory conditions.the natural hosts of amblyomma nodosum in the immature stages are a variety of birds and the anteater in the adult stage. however, so far no data have been published about this tick's life cycle. to fill this gap, a record was made of its development under laboratory conditions. all the procedures were controlled in a bod chamber set at 27±1 °c and 80±10% relative humidity and scotophase. the parasitic stages were raised on rabbits (oryctolagus cuniculus linnaeus, 1758), from which more than 50% ...201526291144
rickettsial infection in ticks from wild birds from cerrado and the pantanal region of mato grosso, midwestern brazil.the involvement of different species of ticks and wild animals, such as birds, play an important role in the epidemiology of tick-borne diseases. birds may serve as reservoirs for some tick-borne diseases, and may carry and spread hematophagous ectoparasites mechanically. this study aimed to show the diversity of ticks on birds and molecular detection of rickettsial infection in ticks from pantanal and cerrado, two similar brazilian biomes characterized by hydrological seasons. during two years, ...201526232933
rickettsial infections in ticks from reptiles, birds and humans in honduras.ticks were collected from captive reptiles, wild birds, and incidentally from humans at two locations in honduras and part of these were tested for the presence of rickettsia using polymerase chain reaction. the following species of ticks were found: amblyomma dissimile on iguanidae reptiles, amblyomma longirostre and amblyomma nodosum on birds, and amblyomma mixtum (amblyomma cajennense complex) on humans. a. dissimile was infected with rickettsia sp. strain colombianensi. both a. longirostre a ...201526159797
rickettsial agents in avian ixodid ticks in northeast brazil.birds are important in the maintenance and spread of ticks and tick-borne diseases. in this context we screened birds in the atlantic forest north of the são francisco river and caatinga in northeast brazil. in the atlantic forest amblyomma longirostre, amblyomma nodosum, amblyomma varium and amblyomma auricularium were identified. a. longirostre was infected by "candidatus rickettsia amblyommii" and a. nodosum by a rickettsia parkeri-like agent. in caatinga, amblyomma parvum and a. auricularium ...201525800099
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
environmentally associated ticks (acari: ixodidae) in campo grande, mato grosso do sul, brazil.herein, we report tick species found on wild and domestic animals and in the environment during a one-year sampling period at the brazilian farming research company beef cattle unit (embrapa beef cattle), which is located within the urban area of campo grande, mato grosso do sul, brazil. from 55 wild hosts including six different species (nasua nasua, cebus spp., cerdocyon thous, myrmecophaga tridactyla, tamandua tetradactyla and dasyprocta aguti), 323 ticks were collected. amblyomma ovale ticks ...201324252958
importation of exotic ticks and tick-borne spotted fever group rickettsiae into the united states by migrating songbirds.birds are capable of carrying ticks and, consequently, tick-transmitted microorganisms over long distances and across geographical barriers such as oceans and deserts. ticks are hosts for several species of spotted fever group rickettsiae (sfgr), which can be transmitted to vertebrates during blood meals. in this study, the prevalence of this group of rickettsiae was examined in ticks infesting migratory songbirds by using polymerase chain reaction (pcr). during the 2009 and 2010 spring migratio ...201324252263
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
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
ticks on birds in a savanna (cerrado) reserve on the outskirts of uberlândia, minas gerais, brazil.we report tick infestations on birds, in the environment and on domestic animals in a non-forested phytophysiognomy, the savanna-like cerrado sensu stricto, in a natural reserve on the outskirts of the urban area of uberlândia, minas gerais, brazil. overall, 238 birds within 50 species, 15 families and six orders were caught. passeriformes were the most numerous, with 216 birds (90.75%), among which 22 had ticks (n = 31). within this order, the prevalence of tick infestation was 10.2%, and the a ...201323471429
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
amblyomma nodosum (acari: ixodidae) parasitizing a domestic dog in colatina, espírito santo, brazil.on 27 jan 2011 an adult amblyomma nodosum tick was found attached to a domestic dog from the municipality of colatina, state of espírito santo, brazil. this is the first report of this tick species in this state and the second time it has been reported parasitizing a domestic dog in the country. for the time being, this finding should be regarded as incidental. however, more in-depth research into the hosts and ecology of a. nodosum is needed, since it has been associated to infectious agents th ...201323207985
the first report of rickettsia spp. in amblyomma nodosum in the state of mato grosso do sul, brazil.ticks are vectors of various pathogens, including rickettsia spp., which are responsible for causing an emerging disease of global significance. in the present study, an epidemiological survey was performed to identify rickettsia spp. of the spotted fever group (sfg) in ticks and wild hosts in a native forest adjacent to livestock farming activity. the ticks and blood were evaluated by a hemolymph test and by pcr using the primers cs78 and cs323, which target a partial sequence of the enzyme cit ...201323084365
wild birds and urban ecology of ticks and tick-borne pathogens, chicago, illinois, usa, 2005-2010.bird-facilitated introduction of ticks and associated pathogens is postulated to promote invasion of tick-borne zoonotic diseases into urban areas. results of a longitudinal study conducted in suburban chicago, illinois, usa, during 2005-2010 show that 1.6% of 6,180 wild birds captured in mist nets harbored ticks. tick species in order of abundance were haemaphysalis leporispalustris, ixodes dentatus, and i. scapularis, but 2 neotropical tick species of the genus amblyomma were sampled during th ...201223017244
tunga penetrans and further parasites in the giant anteater (myrmecophaga tridactyla) from minas gerais, brazil.the brazilian savannah-like area, the cerrado region, covers large areas of the country and provides a habitat for a multitude of different animal species. the giant anteater (myrmecophaga tridactyla) is geographically widespread and one of the typical inhabitants of the cerrado. they are listed as vulnerable by the international union for conservation of nature and natural resources. a population loss of at least 30 % over the past 10 years has been estimated based on local extinctions, habitat ...201222814770
bird ticks in an area of the cerrado of minas gerais state, southeast brazil.in the present study the tick prevalence, mean intensity of infestation and species were recorded on birds captured between january 2009 and december 2010 in the ecological station pirapitinga-esec from minas gerais state, brazil. a total of 967 birds, from 15 families and 40 species were captured and 165 (17.1 %) individuals were parasitized by ticks. of these 160 (97 %) belonged to the order passeriformes. five tick species were identified: amblyomma longirostre (n = 274) was the most common s ...201222729500
identification of rickettsia africae and wolbachia sp. in ceratophyllus garei fleas from passerine birds migrated from africa.the aim of the study was to reveal new aspects of the role of flea vector taken from migratory birds by screening of specimens with molecular biological methods. a field study was done in fishponds in slovakia. actually, 47 fleas were collected from reed warblers (acrocephalus scirpaceus) and their nests. dna was extracted and analyzed for representatives of the orders rickettsiales. a rickettsia that shares 99.7% of identity by glta gene with rickettsia africae was identified in ceratophyllus g ...201222448745
ticks (acari: ixodidae) infesting wild birds in the atlantic forest in northeastern brazil, with notes on rickettsial infection in ticks.a total of 232 individuals representing 46 species of birds were mist-netted and screened for ticks in a region of the atlantic forest, state of bahia, brazil. thirty-eight (16.4%) of these birds representing 17 species were found infested by immature stages of amblyomma ticks, namely, amblyomma longirostre (koch, 1844) (15 larvae and seven nymphs), amblyomma nodosum (neumann, 1899) (nine nymphs), amblyomma calcaratum (neumann, 1899) (five nymphs), amblyomma cajennense (fabricius, 1787) (seven l ...201020953629
survey of ticks (acari: ixodidae) and their rickettsia in an atlantic rain forest reserve in the state of são paulo, brazil.the current study investigated the occurrence of ticks and their rickettsiae in the serra do mar state park, which encompasses one of the largest atlantic rain forest reserves of brazil. from july 2008 to june 2009, a total of 2439 ticks (2,196 free living and 243 collected on hosts) was collected, encompassing the following 13 species: amblyomma aureolatum (pallas), amblyomma brasiliense aragao, amblyomma dubitatum neumann, amblyomma fuscum neumann, amblyomma incisum neumann, amblyomma longiros ...201020939390
isolation of rickettsia parkeri and identification of a novel spotted fever group rickettsia sp. from gulf coast ticks (amblyomma maculatum) in the united states.until recently, amblyomma maculatum (the gulf coast tick) had garnered little attention compared to other species of human-biting ticks in the united states. a. maculatum is now recognized as the principal vector of rickettsia parkeri, a pathogenic spotted fever group rickettsia (sfgr) that causes an eschar-associated illness in humans that resembles rocky mountain spotted fever. a novel sfgr, distinct from other recognized rickettsia spp., has also been detected recently in a. maculatum specime ...201020208020
ticks (acari: ixodidae) infesting birds in an atlantic rain forest region of brazil.brazil has the third richest bird diversity of the world; however, there are few data concerning ticks (acari: ixodidae) parazitizing birds. the aim of the study was to report tick infestations on wild birds from an atlantic rain forest region of brazil. during 2 yr, ticks were collected from birds and from the environment in 12 forest sites. a total of 1,725 birds were captured representing 80 species from 24 families. in total, 223 (13%) birds were found infested by immature stages of amblyomm ...200919769058
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
rickettsial infection in amblyomma nodosum ticks (acari: ixodidae) from brazil.the rickettsial infections in 174 amblyomma nodosum found on passeriform birds in the atlantic forest, eastern brazil, have recently been evaluated. rickettsiae were successfully isolated from two ticks, using cultures of vero cells. both isolates were molecularly characterised, using the rickettsial genes glta and htra and, when possible, also ompa and ompb. portions of the glta and htra genes from one of the rickettsial isolates were found be closely match the corresponding genbank sequences f ...200919583912
ticks collected on birds in the state of são paulo, brazil.the present study reports a collection of amblyomma spp. ticks in birds from several areas of the state of são paulo, brazil. a total of 568 tick specimens (404 larvae, 164 nymphs) were collected from 261 bird specimens. from these ticks, 204 (36%) specimens (94 larvae, 110 nymphs) were reared to the adult stage, being identified as amblyomma longirostre (94 larvae, 90 nymphs), amblyomma calcaratum (13 nymphs), amblyomma nodosum (2 nymphs), and amblyomma cajennense (5 nymphs). additionally, 39 l ...200717882514
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
species diversity and seasonality of free-living ticks (acari: ixodidae) in the natural habitat of wild marsh deer (blastocerus dichotomus) in southeastern brazil.this study evaluated the presence and seasonal activity of free-living ticks in remaining marsh areas by the paraná river, in brazil. eight field trips (once per season) for collection of ticks were performed during 2 years. using co2 traps, dragging, and visual inspection of vegetation, five free-living tick species were collected, in the following order of abundance: amblyomma cajennense, amblyomma dubitatum, amblyomma triste, amblyomma coelebs, and amblyomma nodosum. the seasonal pattern of a ...200716962241
ticks (acari: ixodidae) associated with wild animals in the pantanal region of brazil.this paper describes the identification of ticks from wild animals of the pantanal region in brazil as part of a comprehensive study about established and emerging tick-host relationships and related pathological aspects. eighty-one animals were captured (representing 13 species, six orders), and ticks were found on 63 (78%). tick species identified included boophilus microplus (canestrini), amblyomma cajennense (f.), amblyomma parvum aragão, amblyomma pseudoconcolor aragão, amblyomma scalpturat ...200011126563
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