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co-circulation of multiple colorado tick fever virus genotypes.colorado tick fever (ctf) virus, family reoviridae, genus orbivirus, contains 12 genes distinguishable by polyacrylamide gel electrophoresis (page). multiple genotypes of ctf virus were isolated at 3 field sites in colorado in 1985. five genotypes were found at campos cabin, 2 at drake, and 6 at rocky mountain national park. virus isolations were made in 1985 from 6 patients with ctf. these isolates were distinct from each other and the field isolates. although the ctf isolates were different by ...19892916731
the ecology of colorado tick fever in rocky mountain national park in 1974. iii. habitats supporting the virus.ecologic studies of small mammals in rocky mountain national park (rmnp) were conducted in 1974 in order to identify the specific habitats within the lower montane forest that support colorado tick fever (ctf) virus. data was collected on the abundance and distribution of 4 primary rodent species, tick infestation, ctf virus, and neutralizing antibody prevalence. rodents were captured along transects crossing different habitats. open stands of ponderosa pine and shrubs on dry, rocky surfaces wer ...19892537045
parasites of the black-tailed jackrabbit in north central colorado.forty-four black-tailed jackrabbits, lepus californicus melanotis mearns, 1890, were collected near denver from august, 1972, through july, 1973, and amined for parasites. recovered parasites and their infection rates were: eimeria sp. 100%, cittotaenia sp.27%, coenuri of multiceps sp. 57%, cediopsylla inaequalis 14%, hoplopsyllus affinis 9%, haemodipsus setoni 2%, dermacentor andersoni 14%, and haemaphysalis leporis-palustris 25%.19751142561
distribution and prevalence of cytauxzoon felis in bobcats (lynx rufus), the natural reservoir, and other wild felids in thirteen states.cytauxzoon felis, a protozoan parasite of wild and domestic felids, is the causative agent of cytauxzoonosis in domestic and some exotic felids in the united states. the bobcat (lynx rufus) is the natural reservoir for this parasite, but other felids such as florida panthers (puma concolor coryii) and domestic cats may maintain long-term parasitemias and serve as reservoirs. experimentally, two tick species, dermacentor variabilis and amblyomma americanum, have demonstrated the ability to transm ...201021071149
epidemiology of colorado tick fever in montana, utah, and wyoming, 1995-2003.colorado tick fever (ctf) is a biphasic, febrile illness caused by a coltivirus and transmitted by the rocky mountain wood tick, dermacentor andersoni, in the western united states and canada. symptoms generally include acute onset of fever, headache, chills, and myalgias; illness often lasts for 3 weeks or more. laboratory-confirmed cases of ctf were identified from public health department records in montana, utah, and wyoming, and from the centers for disease control and prevention diagnostic ...201019725767
indicators for elevated risk of human exposure to host-seeking adults of the rocky mountain wood tick (dermacentor andersoni) in colorado.the human-biting adult stage of the rocky mountain wood tick (dermacentor andersoni) can cause tick paralysis in humans and domestic animals and is the primary tick vector in the intermountain west of the pathogens causing colorado tick fever, rocky mountain spotted fever, and tularemia. we conducted drag sampling studies in poudre canyon and rocky mountain national park of larimer county, co, to determine microhabitat use patterns by host-seeking d. andersoni adults and find environmental facto ...200818697314
sequence and expression analysis of the ompa gene of rickettsia peacockii, an endosymbiont of the rocky mountain wood tick, dermacentor andersoni.the transmission dynamics of rocky mountain spotted fever in montana appears to be regulated by rickettsia peacockii, a tick symbiotic rickettsia that interferes with transmission of virulent rickettsia rickettsii. to elucidate the molecular relationships between the two rickettsiae and glean information on how to possibly exploit this interference phenomenon, we studied a major rickettsial outer membrane protein gene, ompa, presumed to be involved in infection and pathogenesis of spotted fever ...200415528527
novel potential reservoirs for borrelia sp. and the agent of human granulocytic ehrlichiosis in colorado.previous work demonstrated that ixodes spinipalpis ticks maintained an enzootic cycle of borrelia bissettii and the agent of human granulocytic ehrlichiosis (aohge) within woodrats (neotoma mexicana) and deer mice (peromyscus maniculatus) in northern colorado (usa). because i. spinipalpis is the only known vector of b. bissettii and aohge in colorado, this study was designed to determine the reservoir status of other hosts of i. spinipalpis in five distinct ecological zones along the front range ...200212038153
survey for evidence of colorado tick fever virus outside of the known endemic area in california.a virus very similar or identical to colorado tick fever (ctf) virus was recovered from the blood clot of one of 104 black-tailed jack rabbits (lepus californicus) examined during a survey for various zoonotic agents in mammals and ticks from the university of california, hopland field station, mendocino county, california, 1974--79. this is the first reported isolation of a ctf-like virus from l. californicus, and only the second time such a virus has been found in northwestern california. mend ...19827102919
seasonal activity and colorado tick fever virus infection rates in rocky mountain wood ticks, dermacentor andersoni (acari: ixodidae), in north-central colorado, usa. 19836827573
the ecology of colorado tick fever in rocky mountain national park in 1974. ii. infection in small mammals.field studies of colorado tick fever (ctf) in small mammals in rocky mountain national park (rmnp) in 1974 established that eutamias minimus and spermophilus lateralis were the most important hosts for ctf virus and were the source of virus for immature stages of the tick vector, dermacentor andersoni. other species (peromyscus maniculatus, spermophilus richardsonii, eutamias umbrinus) are secondary hosts. the intensity of viral activity in rodents varied greatly from locality to locality. highe ...19816263122
collection of dermacentor andersoni (stiles) with carbon dioxide and its application in studies of colorado tick fever virus. 19655841585
climate-based model predicting acarological risk of encountering the human-biting adult life stage of dermacentor andersoni (acari: ixodidae) in a key habitat type in colorado.we exploited an elevation (climate) gradient ranging from 1,700 to 2,500 m in poudre canyon of larimer county, co, to determine climatic correlates of abundance per 15-s drag sampling time unit (hereafter referred to as abundance) of the human-biting adult life stage of the rocky mountain wood tick, dermacentor andersoni stiles (acari: ixodidae), in a key risk habitat for tick exposure: south/west-facing, rocky hillsides with mixed grass-brush-conifer vegetation. the relationship between elevati ...200717695027
seasonal pattern of host-seeking activity by the human-biting adult life stage of dermacentor andersoni (acari: ixodidae).nonremoval drag sampling was conducted in multiple sites in larimer county, co, from march to july 2006 to determine the seasonal pattern of host-seeking activity by the human-biting adult life stage of the rocky mountain wood tick, dermacentor andersoni stiles (acari: ixodidae). four sites, at elevations ranging from 1,790 to 2,470 m, consistently yielded host-seeking ticks. ticks were active from march until late june; the length of the active period ranged from 84 to 104 d. based on site-spec ...200717427709
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