Virological investigations in adults with acute pneumonia.

: Virological investigations (immunofluorescence reactions and isolation attempts with pharyngeal exudate specimens, as well as serological tests) were performed in 110 adult patients with pneumonia. Viral or inframicrobial agents were involved in 70 (63.7%) of the cases, either alone (27 cases) or in association with bacteria (43 cases). Parainfluenza and adenoviruses were most frequently encountered both in the cases with mixed (viral + bacterial) and in those with strictly viral pneumonia. Mycoplasma pneumoniae accounted for 11% of the cases; the role of chlamydial and rickettsial germs was insignificant.