Primary care data
Overall, the majority of countries reported low or medium intensity of activity of respiratory infections, based on syndromic surveillance data for influenza-like illness (ILI) and/or acute respiratory infection (ARI). The majority of countries reported widespread detections of laboratory-confirmed influenza cases.
Influenza activity was at variable levels across the region in week 6/2018.
Of 46 Member States and areas reporting on intensity, Albania and Luxembourg reported very high intensity, while Finland, Germany, Ireland, Slovakia, Sweden and Kosovo (in accordance with Security Council resolution 1244 (1999)) reported high intensity; 26 Member States and the UK (England, Northern Ireland and Wales) reported medium intensity and 12 Member States and the UK (Scotland) low intensity.
Of the 46 Member States and areas reporting on geographic spread, 29 Member States and the UK (Scotland) reported widespread activity, while others reported regional (n=6), local (n=4), or sporadic spread (n=6 and the UK (England and Northern Ireland)).
Viruses detected in sentinel-source specimens (ILI and ARI)
For week 6/2018, 1 837 (51%) of 3 603 sentinel specimens tested positive for influenza viruses. Of these, 27.8% were type A and 72.2% were type B. Of 377 subtyped A viruses, 67.9% were influenza A(H1N1)pdm09 and 32.1% A(H3N2). Of 600 type B viruses ascribed to a lineage, 99% were B/Yamagata and 1% B/Victoria.
Of 37 Member States across the region that each tested at least 10 sentinel specimens in week 6/2018, 33 reported proportions of influenza virus detections above 30% (range of 32% to 80%).
Overall, since week 40/2017, more influenza type B (67.2%) than type A (32.8%) viruses have been detected. Of 4 128 subtyped A viruses, 64.6% were A(H1N1)pdm09. The majority of type B viruses were reported without lineage, but of the 4 006 ascribed to a lineage, 96.8% were B/Yamagata.
Details of the distribution of viruses detected in non-sentinel-source specimens can be found in the Virus characteristics section.