Abstract
Healthy individuals at high risk of exposure to ticks were surveyed to determine the prevalence and incidence of asymptomatic babesiosis on Shelter Island, New York, during a single transmission season. Paired sera obtained in June and October 1978 were tested for antibodies to Babesia microti by indirect immunofluorescence. Point prevalence values of 4.4% in June and 6.9% in October were obtained. Six of 102 persons tested in both months showed at least a fourfold rise in titer of antibodies to B. microti (an incidence of 5.9% for the season). None of 300 serum specimens obtained from the New York City metropolitan area had significant titers to B. microti. Of the six persons who seroconverted, four gave a history of tick bite during the transmission season; three of the four persons claimed to recognize the tick as an Ixodes dammini, the vector for B. microti.
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