title: Community-acquired pneumonia: is there difference in etiology between hospitalized and out-patients?
abstract: Since March 1991 a prospective 1-year study of patients with community-acquired, radiologically verified, pneumonia (CAP) was performed at the Divisione Pneumologica, Ospedali Riuniti Bergamo, and at the Centro Pneumo-Allergologico, Bergamo, Italy. The study included 119 out-patients and 60 in-patients, with a median age of 37.4 and 49.8 years respectively. There were not statistically significant differences between the patients included with respect to the various months. The most common underlying illnesses were: chronic obstructive pulmonary disease (20.7%), diabetes (7.3%) and malignancy (3.4%). We found a quite different etiology of CAP between out- and in-patients. By far the most common etiologic agent in out-patients was Mycoplasma pneumoniae (32.8%), while in in-patients was Legionella pneumophila (11.7%). 5 patients had a double infection. There were no distinctive clinical and radiological features found to be diagnostic for any etiologic agent. Hospital stay averaged 12.1 days. 35% of the patients included in the study were been treated by beta-lactam, often parenterally, nevertheless 88 pathogens of the 100 identified were resistant to this antimicrobial therapy. We believe that there should always be a macrolide, erythromycin or the latest ones such as azythromycin, in the treatment of CAP, owing to their efficiency, ease of use and lower cost.
authors.affiliation: Divisione di Pneumologia, Ospedali Riuniti, Bergamo.
authors.forename: G
authors.initials: G
authors.lastname: Michetti
authors.forename: C
authors.initials: C
authors.lastname: Pugliese
authors.forename: M
authors.initials: M
authors.lastname: Bamberga
authors.forename: M
authors.initials: M
authors.lastname: Ori Belometti
authors.forename: R
authors.initials: R
authors.lastname: Villa
authors.forename: L
authors.initials: L
authors.lastname: Maggi
authors.forename: S
authors.initials: S
authors.lastname: Ranzanici
authors.forename: V
authors.initials: V
authors.lastname: Perani
authors.forename: C
authors.initials: C
authors.lastname: Farina
authors.forename: F
authors.initials: F
authors.lastname: Moioli
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001419:Bacteria / Q000302:isolation & purification; D016009:Chi-Square Distribution; D017714:Community-Acquired Infections / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology / Q000382:microbiology; D005260:Female; D006801:Humans; D007297:Inpatients / Q000706:statistics & numerical data; D007558:Italy; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D010045:Outpatients / Q000706:statistics & numerical data; D018410:Pneumonia, Bacterial / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology* / Q000382:microbiology; D011446:Prospective Studies; D011859:Radiography
chemical_list: D000900:Anti-Bacterial Agents