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Antibody titers in sera from experimentally infected dogs identified by Lyme Quant C6 ELISA. Serum samples were obtained on day 13 prior to infection (d-13) and on days 21, 35, 49, 63, 77, and 92 p.i. The graph shows mean values and standard errors for C6 antibody values of the control group and two experimentally infected groups by exposure to 25 or 50 ticks per dog. The dotted line indicates the positive cutoff value of the C6 ELISA (>30 U/ml).
