Data from The EuroFlu bulletin, that describes and comments on influenza activity in the 53 Member States in the WHO European Region
Sentinel swabs (% pos.): number of sentinels swabs tested for influenza and percentage that tested positive for influenza A or B.
0= No activity, no laboratory-confirmed cases, or evidence of increased or unusual respiratory disease activity;
1= Sporadic, isolated cases of laboratory-confirmed influenza infection;
2= Localized, limited to one administrative unit in the country (or reporting site) only;
3= Regional, appearing in multiple but <50% of the administrative units of the country (or reporting sites);
4= Widespread, appearing in >=50% of the administrative units of the country (or reporting sites).