[The incidence of exacerbations in chronic diseases in patients hospitalized with influenza and para-influenza].

A retrospective analysis was made of the case reports of 829 patients admitted to the infectious department with a diagnosis of influenza (592) and parainfluenza (237). In all the patients, the diagnosis was supported serologically with the aid of the hemagglutination inhibition test, with the antibody titer in the serum rising 4-fold and more. In part of the patients the indicated test was used in combination with the immunofluorescence test in studying nasopharyngeal smears, whereas in part of the patients, it was coupled with virological tests. It has been revealed that in addition to the most frequently occurring complications on the part of the bronchopulmonary system and ENT organs caused by the pneumococcal and streptococcal flora, there were complications on the part of the endocrine, urogenital, nervous and gastrointestinal systems, equally in patients with influenza and parainfluenza. In patients with postinfarction cardiosclerosis, influenza B and mixed influenza run the most unfavourable course, provoking deterioration of coronary heart disease in every other patient. In 66.6% of cases, exacerbation of coronary heart disease fell within the period of early convalescence of patients with influenza and parainfluenza.