prevalence of antibodies to borrelia burgdorferi in forestry workers and blood donors from the same region in switzerland.sera from 259 forestry workers and 100 blood donors in the canton of solothurn, switzerland, were tested for igg antibodies to borrelia burgdorferi in two eias using as antigen either sonic extract of whole organisms or purified flagella. applying a 95% specific cut-off value based on results in the sera of 100 blood donors, 86 (33%) and 91 (35%) of the forestry workers respectively showed an elevated specific igg level in the two eias. none of the 259 forestry workers had clinical signs of acti ...19892513202
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