Q fever - CDNA National Guidelines for Public Health Units

Two serum/clotted blood samples should, therefore, always be collected if Q fever is suspected — one at presentation, and another 2–3 weeks later, even if the patient has since recovered. Seroconversion usually occurs within 7–15 days after exposure, and ninety per cent (90%) of cases have seroconverted by the third week after exposure. ................
................