CD40LG and Lyme disease: miyamotoi sensu lato�?"seropositive study participants without a clinical history of Lyme disease within the previous 2 years, 7 (19.4%) had test results positive for B. burgdorferi by IgG and/or IgM ELISA, 6 (16.7%) had test results positive for C6 ELISA, and 4 (11.1%) had test results positive for standard 2-tier ELISA plus confirmatory Western blot (Table 2).