Volume 81, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


The Lyme borreliosis agent and the relapsing fever group species co-occur in the United States. We used species-specific, quantitative polymerase chain reaction to study both species in the blood and skin of mice and host-seeking nymphs at a Connecticut site. Bacteremias with or were most prevalent during periods of greatest activity for nymphs or larvae, respectively. Whereas was 30-fold more frequent than in skin biopsies and mice had higher densities of densities in the skin than in the blood, densities were higher in blood than skin. In a survey of host-seeking nymphs in 11 northern states, infection prevalences for and averaged ~0.20 and ~0.02, respectively. Co-infections of or with both and were neither more nor less common than random expectations.


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  • Received : 22 Apr 2009
  • Accepted : 03 Aug 2009

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