The article presents the preliminary data analysis of past "pandemic" and regional epidemics in the world caused by the influenza virus A(H1N1)sw1. Draw conclusions about the relative softness of the clinical and epidemiological manifestations of recent developments in connection with the lack of antigenic shift from a new strain and a significant protective role of acquired earlier population of cross-immunity of population to variants of influenza virus A(H1N1)sw1. In military units as representative risky groups are reflected all the laws of the epidemic process of influenza in the population. Consequently, the results of epidemiological surveillance in them can be extrapolated to the population and make a forecast of the epidemic in order to develop strategies and tactics to combat this infection in a large scale.