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Influenza: problem in Poland as elsewhere.

The present paper deals with the epidemiological and clinical properties of influenza, taking into consideration differences in the course of the disease its consequences, and infections in high-risk groups. Special attention was paid to problems connected with influenza prophylaxis, and especially to the problem of vaccination. The authors point out that if the vaccine contains recommended strains for a given season and if the vaccination is done in the proper time, the immunity obtained in this way is effective.