An outbreak of Q fever affecting postal workers in Oxfordshire.

Twenty-five people in Oxfordshire were found to have had clinical illness due to Q fever in the 3 months from April to June 1983. Twelve cases were diagnosed through the routine laboratory diagnostic service. Five of these were postmen, four of whom worked in a sorting office where an outbreak of illness similar to influenza had been noted by the Occupational Health Nurse. Thirteen cases were diagnosed by active case-finding in this sorting office but investigation failed to define the source of the outbreak. Nine of the 18 postal workers were found to have antibodies to phase I Coxiella burnetii antigen. The significance of these antibodies is discussed. Surveillance for over 2 years has not revealed anyone with symptoms or signs suggestive of chronic Q fever. An outbreak of Q fever among postal workers has not previously been described. We recommend continued surveillance for this enigmatic condition.