Epidemioligical particularities of influenza outbreaks in a town of Romania during 1975.

: Results are presented of the complex epidemiological influenza surveillance in a large town of Romania during 1975. The comprehensive and unitary methodology including systematic laboratory, clinical and epidemiological investigations supplied data on the influenza type A outbreak recorded during the first term of 1975. The factors of importance for epidemiological prognosis -- seroepidemiological indicators of the immunological profile of the population according to age groups, serodiagnostic and virological investigation clinically diagnosed influenza cases, complex epidemiological surveys in representative foci, study of the antigenic structure of the influenza strains isolated -- are outlined. The importance of a continuous, complex influenza surveillance for the differential orientation of prophylaxis and control steps is emphasized.