Part three covers influenza epidemiology, acute respiratory disease patterns in the USSR, flu immunology and prophylaxis, along with topics including antigenic drift in Hong Kong H3N2 virus hemagglutinin, RIA techniques for determining influenza virus nucleoprotein, and viral persistence in biological systems.

First published in 1990. Part three is devoted to the epidemiology of influenza, the current etiological pattern of acute respiratory diseases in the USSR, the immunology of flu and of influenza and influenza prophylaxis in the USSR. Other topics reviewed include antigenic drift in the hemagglutinin of Hong Kong [H3N2] virus over the period of its circulation, RIA techniques of determining the influenza virus nucleoprotein and the persistence of influenza virus in different biological systems.