The study presents the evolutive peculiarities of the epidemiologic influenza process in 1986 in a large urban centre in Romania, inferrable from the active control by a complex methodology based on clinical, epidemiologic and laboratory investigations. The prevalent part of A (H1N1 and H3N2) and B influenza viruses in causing seasonal morbidity risings is being stressed. A (H3N2) and B influenza viruses determined an epidemic rising during the first trimester and A (H1N1) and A (H3N2) during the fourth trimester in 1986. The epidemiologic influenza impact in 1986 is discussed from the point of view of the complex relationships between the antigenic structure of circulating influenza viruses and the antiinfluenza immune structure of the population.
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