K Kuszewski1, L B Brydak, M Machała
1Zakład Epidemiologii Państwowego Zakładu Higieny ul. Chocimska 24, 00-791 Warszawa.
Influenza cases in Poland surged in 1999, with over 2.3 million reported cases and a significant increase in hospitalizations and deaths compared to 1998. Six influenza B virus strains, antigenically related to the vaccine strain, were identified.
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