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The prevalence and incidence of clinical and asymptomatic Lyme borreliosis in a population at risk.

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Abstract

A past history of clinical
Lyme borreliosis and the 6-month incidence of clinical and asymptomatic
Lyme borreliosis was studied prospectively in a high-risk population. In the spring, blood samples were drawn from 950 Swiss orienteers, who also answered a questionnaire. IgG anti-Borrelia burgdorferi antibodies were detected by ELISA. Positive IgG antibodies were seen in 248 (26.1%), in contrast to 3.9%-6.0% in two groups of controls (n = 101). Of the orienteers, 1.9%-3.1% had a past history of definite or probable clinical
Lyme borreliosis. Six months later a second blood sample was obtained from 755 participants, 558 (73.9%) of whom were seronegative initially; 45 (8.1%) had seroconverted from negative to positive. Only 1 (2.2%) developed clinical
Lyme borreliosis. Among all participants, the 6-month incidence of clinical
Lyme borreliosis was 0.8% (6/755) but was much higher (8.1%) for asymptomatic seroconversion (45/558). In conclusion, positive
Lyme serology was common in Swiss orienteers, but clinical
disease occurred infrequently.

J Infect Dis. 1991 Feb;163(2):305-10. Research Support, Non-U.S. Gov’t

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