Given that the percentage of vaccinated population in this age range in Poland ranks at a dismally low level and has a decreasing trend from 1.95% in 2011 to 1.37% in 2015 (Epimeld 2016 ), it can be judged that that the recorded number of influenza cases reflects the immunodeficiency to this viral strain (Brydak 2015 ).
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The Activity of Influenza and Influenza-like Viruses in Individuals Aged over 14 in the 2015/2016 Influenza Season in Poland.
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