Q fever infection in chronic obstructive pulmonary disease.
D000328:Adult; D000368:Aged; D001982:Bronchial Diseases / Q000150:complications*; D003168:Complement Fixation Tests; D005260:Female; D006801:Humans; D008297:Male; D011656:Pulmonary Emphysema / Q000150:complications*; D011778:Q Fever / Q000150:complications* / Q000453:epidemiology; D013997:Time Factors