[Nature of the "meta-influenza" stage of influenza].

Investigations of experimental influenza in white mice using morphological, immunofluorescent, virological, and bacteriological methods showed that proliferation of alveolocytes in respiratory parts of the lungs as well as that of bronchial epithelium described in some papers as characteristic of the "metainfluenza" stage of influenza represent actually a spontaneous pathology of mice caused by mycoplasma. This disease is aggravated by influenza infection.