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Month of onset of illness for 203 patients who had acute and convalescent serum samples collected. Chl Chlamydia pneumoniae; Inf A Influenza A virus; Adenov Adenovirus; Leg Legionella pneumophila; QF Coxiella burnetii – Q fever; MPN Mycoplasma pneumoniae; dx Diagnosis; the clear space represents the number of patients who had no antibody rise to the agents indicated above
