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[Influenza in Poland in 2003]
Krzysztof Kuszewski1, Lidia B Brydak, Magdalena Machała
1Zakład Epidemiologii, Państwowego Zakładu Higieny, ul. Chocimska 24, 00-791 Warszawa. kkuszewski@pzh.gov.pl
Przeglad Epidemiologiczny
|September 30, 2005
Summary
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.
Area of Science:
- Epidemiology
- Virology
- Public Health
Context:
- Poland experienced low influenza incidence for two years prior to 2003.
- Influenza-like illness (ILI) surveillance is crucial for monitoring disease activity.
Purpose:
- To report on the epidemiology and virology of influenza in Poland during the 2003 season.
- To analyze the incidence, severity, and characteristics of influenza cases in Poland.
Summary:
- In 2003, Poland registered 1,216,285 ILI cases, a significant increase from previous years, with an overall incidence of 3,184.4 per 100,000 population.
- Children under 15 represented 41.7% of cases. Hospitalization was required for 0.26% of patients, and 141 deaths (0.12% mortality) were attributed to influenza, predominantly in individuals over 70.
- Influenza A (H3N2) was the most common subtype isolated (15 strains), alongside A(H1N1) (3 strains) and one B strain. All strains were antigenically similar to the 2002/03 and 2003/04 vaccine recommendations.
Impact:
- This study highlights the significant resurgence of influenza in Poland and identifies key demographic groups affected.
- Findings underscore the importance of influenza vaccination, particularly for vulnerable populations like children and the elderly.
- The antigenic similarity of circulating strains to vaccine components suggests continued vaccine effectiveness.