Epidemiologic features of influenza in a large urban centre (B.) in Romania, in 1987

The study presents the peculiarities of influenza evolution in 1987 in a large town in Romania. These features were defined by a complex methodology, based on clinical, epidemiologic and laboratory investigations, used in the active control of the epidemiologic process kinetics. The influenza viruses type A (H1N1 and H3N2) had a major role in the infecting and immunizing contacts in all age groups whereas the influenza virus type B had a reduced circulation. The epidemiologic influenza impact in 1987 is discussed from the point of view of the complex relationships between the antigenic structure of circulating influenza viruses and the anti-influenza immune profile of the population under the influence of extremely complex economic, social and natural factors.