CD40LG and infection: Among the positive blood donors, 61.3% (19/31) had a serological profile (anti‐Coxiella phase II IgM) indicative of a fresh or recent infection and/or were Coxiella DNA positive: 13 donors had a solitary anti‐Coxiella phase II IgM (one of whom was also qPCR positive) and six were positive for both phase II IgM and IgG, while 15 had a solitary phase II IgG response.