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Updated: Aug 19, 2026

Rapid Molecular Detection and Differentiation of Influenza Viruses A and B
Published on: January 30, 2017
[Influenza in 1997]
1Zakład Epidemiologii Państwowego, Zakładu Higieny, Warszawa.
Insights
In 1997, Poland saw a 41.8% decrease in influenza cases compared to 1996, with influenza A (H3N2) viruses circulating. Children experienced higher incidence rates than the general population.
Area of Science:
- Virology
- Epidemiology
- Public Health
Context:
- Influenza surveillance in Poland during 1997.
- Comparison of influenza incidence with the previous year (1996).
- Focus on influenza A (H3N2) virus strains and their antigenic properties.
Purpose:
- To report the epidemiological data of influenza in Poland for 1997.
- To identify and characterize influenza virus strains isolated during the surveillance period.
- To assess the antigenic similarity of circulating strains to vaccine strains.
Summary:
- Poland registered 1,578,494 influenza cases in 1997, a 41.8% decrease from 1996. The overall incidence was 4,084 per 100,000 population.
- Children under 14 represented 35.6% of cases, with an incidence rate 67% higher than the general population.
- Influenza A (H3N2) strains, primarily similar to A/Wuhan/359/95, were isolated throughout the year from various Polish cities.
Impact:
- Provides crucial data for understanding influenza trends and disease burden in Poland.
- Informs public health strategies for influenza prevention and control.
- Highlights the importance of ongoing virological surveillance for vaccine strain selection and efficacy.
Abstract:
The number of cases of influenza and influenza-like illness registered in Poland in 1997 amounted to 1,578,494. This number of cases is 41.8% lower when compared with the previous year 1996. The incidence of influenza amounted to 4,084 per 100,000 inhabitants. The number of influenza cases registered in children aged up to 14 years was 557,033. This is 35.6% of total number of cases. The incidence of influenza in this group amounted to 6,828.7 per 100,000 and was 67% higher than total incidence. In the beginning of January 1997 six strains of A (H3N2) influenza virus were isolated in the National Influenza Center WHO, Dept. of Virology, National Institute of Hygiene. These isolates were similar to A/Wuhan/359/95 and A/Johannesburg/33/94 strains and were obtained from patients aged 5, 6, 45, 50, 75 and 85 living in Warsaw. In February 1997 next six strains A (H3N2) similar to A/Wuhan/359/95 were isolated. Four of them were obtained from patients aged 9, 10, 11 and 14 living in Lublin. One strain was isolated from patient aged 14 living in Kielce and the last one was obtained from patient aged 70 from Warsaw. In general, ten strains isolated in 1997 were similar to the vaccine strain A/Wuhan/359/95 recommended for the epidemic season 1996/97, while two isolates were antigenically similar to the strain included in the vaccine in the previous epidemic season, i.e. 1995/96.
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