Primary care data

Syndromic surveillance data

For the 2019–2020 influenza season, ILI thresholds were defined for 35 Member States or areas and ARI thresholds for 17 Member States or areas.

For week 12/2020, 12 (36%) of the 33 Member States and areas that reported on ILI registered activity above their baseline levels: 2 Member States in eastern areas, 6 in northern areas and 4 in western areas of the Region.

Of 16 Member States and areas that reported on ARI, 3 (19%) registered activity above their baseline levels: 2 Member States in eastern areas and 1 in the northern area of the Region.

Influenza activity

Of 38 Member States and areas that reported on the intensity indicator, 9 reported activity at baseline levels, 21 reported low, 7 reported medium, and 1 reported high (Ireland) intensity for week 12/2020.

Of 37 Member States and areas that reported on geographic spread, 3 reported no activity, 10 reported sporadic spread, 2 reported local spread, 7 reported regional spread and 15 reported widespread activity for week 12/2020.

Viruses detected in sentinel-source specimens (ILI and ARI)

For week 12/2020, 105 (14%) of 760 sentinel specimens from 21 Member States or areas across the Region tested positive for an influenza virus. Among these detections, 60% were type A and 40% were type B. Of 37 subtyped A viruses, 65% were A(H1N1)pdm09 and 35% were A(H3N2). All influenza type B viruses ascribed to a lineage were B/Victoria.

For the season to date, more influenza type A (n=11 109, 65%) than type B (n=6 061, 35%) viruses have been detected. Of 10 115 subtyped A viruses, 60% were A(H1N1)pdm09 and 40% were A(H3N2). Of 2 362 influenza type B viruses ascribed to a lineage, 99% were B/Victoria.

Details of the distribution of viruses detected in non-sentinel-source specimens can be found in the Virus characteristics section.

Influenzanet

Influenzanet is a European wide initiative providing surveillance of ILI in the general population using citizens’ self-reported symptoms. For week 12/2020, per 1 000 active participants, Ireland and Italy reported between 0 and 5 ILI cases; France, Portugal, Spain and Switzerland reported between 5 and 10 ILI cases; Denmark and the United Kingdom reported between 15 and 20 ILI cases.

Based on this system, ILI activity is low (below the first quartile of historical data for this week) in France, Ireland, Italy and Portugal; and medium (between the first and third quartile of historical data) in Denmark, Spain, Switzerland and the United Kingdom.