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  • Title: Influenza in Poland in 2013 and 2013/2014 epidemic season.
    Author: Kondratiuk K, Czarkowski MP, Hallmann-Szelińska E, Staszewska E, Bednarska K, Cielebąk E, Brydak LB.
    Journal: Przegl Epidemiol; 2016; 70(3):407-419. PubMed ID: 27883286.
    Abstract:
    OBJECTIVE: Analysis of epidemiological situation of influenza in Poland in 2013 and 2013/14 epidemic season in reference to previous years and seasons. MATERIAL AND METHODS: Analysis was based on: 1) data collected within influenza routine surveillance system in Poland, including data published in annual bulletins “Infectious diseases and poisonings in Poland” as well as unpublished data gathered in the Department of Epidemiology of the NIPH-NIH; 2) data collected within influenza system - Sentinel, and beyond this system, concerning results of virological tests carried out in 2013/14 epidemic season in the Department of Influenza Research, National Influenza Center in the NIPHNIH and/or laboratories of provincial sanitary and epidemiological stations which are gathered in the National Influenza Center. RESULTS: Compared to 2012, the number of influenza and influenza-like cases increased more than twofold in 2013 in Poland. A total of 3 164 405 cases were reported. Incidence was 8 218.7 per 100,000 population (33 733.2 in 0-4 age group). As many as 0.45% of patients were referred to hospitals. According to the data of the Central Statistical Office, 115 deaths due to influenza were notified. Based on the data of the sanitary inspection (incomplete data), the percentage of population vaccinated against influenza was 2.4% (7.7% of persons aged more than 64 years). A total of 2 780 945 cases were registered in 2013/14 epidemic season. Its peak was reported in March 2014. Incidence was 7 224.0 per 100,000 population (35 172.8 in 0-4 age group). Compared to 2012/13 epidemic season, it was lower by 8.0%. Incidence rates ranged from 29 339.6 in pomorskie voivodeship to 1 306.5 in lubuskie voivodeship. Nearly a half of all cases (48.7%) were registered in children and adolescents up to 15 years. As many as 0.34% of patients were referred to hospitals (0.87% of persons aged more than 64 years). From the data of the Central Statistical Office transpires that 8 deaths due to influenza were reported in epidemic season. Type A influenza subtype H3N2 predominated in all influenza cases. Human respiratory syncytial virus (RSV) was the dominant agent in other viral infections of respiratory tract. Antigenic analysis of influenza strains showed their affinity with vaccine strains of the vaccine recommended for this epidemic season. CONCLUSIONS: In spite of slow improvements, influenza and influenza-like surveillance system in Poland is still not homogeneous and stable enough. It hinders the assessment of current epidemiological situation. For instance, there are difficulties in determining what is the effect of modifications in the surveillance on the increase in the number of influenza and influenza-like cases observed in Poland in recent years. A low percentage of population vaccinated against influenza (with a decreasing trend beginning from 2005) suggests a necessity of revising the methods of promotion and organization of these vaccines used so far. One of the public health priorities should be to increase the percentage of vaccinated population up to the average level in EU countries.
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