Volume 71, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


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 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 were also tested by IFA against , , and 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 and one dog serum had antibodies against a species very closely related to The latter may have been caused by infection with the recently identified COOPERI strain.


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  • Received : 11 Dec 2003
  • Accepted : 09 Feb 2004

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