Krzysztof Kuszewski1, Lidia B Brydak, Magdalena Machała
1Zakład Epidemiologii, Państwowego Zakładu Higieny, ul. Chocimska 24, 00-791 Warszawa. kkuszewski@pzh.gov.pl
Influenza activity surged in Poland in 2003 after two years of low incidence, with over 1.2 million cases reported. Most cases occurred in children, and influenza-like illness led to 141 deaths, primarily among the elderly.
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