Volume 37, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Lyme disease recently has been recognized in Wisconsin. Trapping studies were conducted at four geographically separate and ecologically distinct regions in Wisconsin to elucidate the distribution and host preferences of on small and medium sized mammals, and the occurrence of antibodies to in these wild mammals. Peak larval activity occurred from June–September. Nymphs were most active from May–August. White-footed mice () and chipmunks () were important hosts for immature ticks. Mean numbers of per mouse were highest in regions of high prevalence of Lyme disease. Antibody to was detected in sera of 60/371 (16%) white-footed mice, 5/104 (5%) chipmunks, 3/5 (60%) gray squirrels (), 0/8 raccoons (), and 0/12 opossum (); antibody prevalence correlated positively with occurrence, and seropositive animals were not detected in areas where were not found. Two of 15 recaptured had ≥4-fold changes in antibody titer. was cultured from blood of a captured in west-central Wisconsin, and was observed by direct immunofluorescence in 9/23 (39%) nymphs. In Wisconsin, has increased in numbers and has significantly expanded its range since its first recognition in 1968.


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