The authors submit an analysis of results of surveillance of acute respiratory diseases during the 1988/1989 season in the CSSR. The influenza epidemic took place between the 4th and 11th calendar week with a peak in the 7th week. During the epidemic 19.7% of the population in the CSR contracted the disease. The influenza epidemic was preceded by a high incidence of infections caused by a respiratory syncytia virus. As to the aetiology, influenza viruses subtypes A/H1N1/, A/H3N2/ and type B participated practically equally in the epidemic. The authors discuss the observed changes in the influenza epidemiology in recent years in Czechoslovakia and neighbouring countries.
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