CD40LG and Q fever: Out of 661 study participants, 52 (7.9%) had seroprevalence of Q fever (IgG ≥1:256 and/or IgM ≥1:16) and 106 (16.0%) were seroreactive (IgG ≥1:16 and/or IgM ≥1:16) test results performed by IFA method.