[Characteristics of dynamics of influenza epidemics and trends of change]

Long-term epidemiological data on 60 reference bases (cities) of the Regional Influenza and Acute Respiratory Disease Center (for the former USSR) are analyzed. Trends in developing an epidemiological process are defined. It is shown that the rate influenza A epidemics has been recently declined, its morbidity is decreasing among adults and increasing among children: influenza A epidemics has recently shown mainly its endogenous spread. Influenza B epidemics have become more intensive, but in the past years influenza B morbidity has been also stable.