Seroprevalence of human granulocytic ehrlichiosis among permanent residents of northwestern Wisconsin.

Four-hundred seventy-five permanent residents of Wisconsin were tested for antibodies to the agent of human granulocytic ehrlichiosis (HGE) by indirect immunofluorescent antibody (IFA) testing with Ehrlichia equi as antigen marker. Each resident completed a standard survey questionnaire about outdoor activities, animal and tick exposure, and any febrile illness during the preceding 12 months. Seventy-one serum samples (14.

Serological evidence of human granulocytic ehrlichiosis in Norway.

Human granulocytic ehriichoisis was first described in 1994. This tick-transmitted illness is increasingly recognized in the USA as well as in Europe in areas where ixodes ticks and Lyme borreliosis are endemic. Blood samples from 58 Norwegian patients with physician-diagnosed Lyme borreliosis were examined for the presence of antibodies to Ehrlichia equi, a surrogate marker of the agent of human granulocytic ehrlichiosis.

Clinical and laboratory characteristics of human granulocytic ehrlichiosis.

Objective: To characterize the clinical and laboratory features observed in patients with human granulocytic ehrlichiosis (HGE) and evaluate the utility of the diagnostic tools used to confirm the diagnosis.

Design: Retrospective case study of 41 patients with laboratory-diagnosed HGE.

Setting: A total of 228 patients from Minnesota and Wisconsin were evaluated between June 1990 and May 1995.