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IgG antibody response to B. burgdorferi sensu stricto lysate antigen. Mice were inoculated with different Borrelia species (A to G), and sera were tested at days 28 and 56 postinoculation for the presence of a rising overall Borrelia IgG response. The cutoff (73.03) was set at mean KELA units value of sera from 27 uninfected mice plus five times the SD of the mean.
