Influenza pandemics, whether mild, moderate or severe, affect a large proportion of the population and require a multisectoral response over several months or even years. For this reason, countries develop plans describing their strategies for responding to a pandemic supported by operational plans at national and subnational levels.
ECDC and WHO/Europe publish weekly influenza surveillance data in the report Flu News Europe. This report covers the period week 44/2017 (30 October–5 November 2017).