Radioaerosol method was employed to follow up mucociliary transport (M
T) efficacy in 97 patients with acute pneumonia (AP). The most pronoun
ced suppression of MT was found in repeated and lingering AP. If causa
tive agents were represented by adenoviruses, streptococci and influen
za bacillus suppression of MT appeared more noticeable. Correlations o
f MT with pulmonary ventilation support the role of mucociliary insuff
iciency in genesis of bronchial obstruction in AP. The majority of the
convalescents fail to achieve complete recovery of MT.