Serological evidence of infection with Ehrlichia spp. in red foxes (Vulpesvulpes) in Switzerland

Serum samples from 1,550 red foxes in Switzerland were tested for antibodie s to the agents of canine granulocytic and monocytic ehrlichiosis by an ind irect immunofluorescent technique. Forty-four (2.8%) of the samples were po sitive for Ehrlichia phagocytophila, which is an antigen marker for granulo cytic ehrlichiosis. In contrast, none of the samples had antibodies specifi c to Ehrlichia canis, the agent of monocytic ehrlichiosis.