Prevalence of antibodies to spotted fever group rickettsiae in humans and domestic animals in a brazilian spotted fever−endemic area in the state of São Paulo, Brazil : serologic evidence for infection by Rickettsia rickettsii and another spotted fever group rickettsia.
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2004
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In serum samples obtained from all the healthy humans, horses, dogs, and donkeys present on three farms
in the Pedreira Municipality, an endemic area for Brazilian spotted fever, an indirect immunofluorescence assay (IFA)
detected antibodies against Rickettsia rickettsii in 17 (77.3%) horses, 5 (31.3%) dogs (titers ranging from 64 to 4,048), and
none of 4 donkeys or 50 humans. Five canine and eight equine sera with high antibody titers to R. rickettsii were also
tested by IFA against R. bellii, R. akari, and R. africae antigens. Sera from two horses and two dogs that showed similar
high antibody titers against two rickettsial antigens were evaluated after cross-absorption. Sera from seven horses and
two dogs contained antibodies specific for R. rickettsii, and one dog serum had antibodies against a Rickettsia species very
closely related to R. africae. The latter may have been caused by infection with the recently identified COOPERI strain.
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HORTA, M. C. et al. Prevalence of antibodies to spotted fever group rickettsiae in humans and domestic animals in a brazilian spotted fever−endemic area in the state of São Paulo, Brazil: serologic evidence for infection by Rickettsia rickettsii and another spotted fever group rickettsia. American Journal of Tropical Medicine and Hygiene, v. 71, n.1, p. 93-97, 2004. Disponível em: <http://www.ajtmh.org/content/71/1/93.long>. Acesso em: 29 jan. 2017.