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epidemiology of potomac horse fever: an investigation into the possible role of non-equine mammals.a serological study of antibodies to ehrlichia risticii was carried out on 10 species of wild and domestic mammals found on or near 21 horse farms in an area of the usa in which potomac horse fever is endemic. no antibodies were found in 133 peridomestic rodents (norway rats and house mice), nor in 108 wild rodents (white-footed mice and meadow voles) captured on farms. three of the six domestic animal species examined, cats, pigs and a goat, showed serological evidence of exposure to e risticii ...19892773237
equine ehrlichial colitis (potomac horse fever): recognition of the disease in pennsylvania, new jersey, new york, ohio, idaho, and connecticut.equine ehrlichial colitis (potomac horse fever), a newly identified colitis of the horse, was first recognized in maryland. in this report, we document occurrence of the disease in pennsylvania, new jersey, new york, ohio, idaho, and connecticut. enzootic areas were recognized by a characteristic pattern. frequently there was a seasonal pattern and high prevalence of sporadic colitis in unstressed horses. the attack rate per farm generally was low. horses on pasture, as well as those stabled, we ...19863744978
prevalence of bartonella species, haemoplasma species, ehrlichia species, anaplasma phagocytophilum, and neorickettsia risticii dna in the blood of cats and their fleas in the united states.ctenocephalides felis were killed and collected from 92 cats in alabama, maryland, and texas. the fleas and blood from the corresponding cat were digested and assessed in polymerase chain reaction assays that amplify dna of ehrlichia species, anaplasma phagocytophilum, neorickettsia risticii, mycoplasma haemofelis, 'candidatus m haemominutum' and bartonella species. dna consistent with b henselae, b clarridgeiae, m haemofelis, or 'candidatus m haemominutum' was commonly amplified from cats (60.9 ...200616290092
white-footed mice: tick burdens and role in the epizootiology of potomac horse fever in maryland.one hundred ten white-footed mice (peromyscus leucopus) were captured on horse farms in south-central maryland, examined for ticks, and tested for specific antibodies to ehrlichia risticii, the causative agent of potomac horse fever. peromyscus leucopus were consistently infested with immature american dog ticks (dermacentor variabilis), with monthly prevalences as high as 80%. sera from all 97 p. leucopus tested for antibodies to e. risticii were negative. this indicates that p. leucopus is not ...19892668569
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