Primary care data
Overall, the majority of countries reported low or medium intensity of activity of respiratory infections, based on sentinel 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 10/2018.
Of 46 Member States and areas reporting on intensity, Luxembourg reported very high intensity, while the Czech Republic, Finland, Germany and Sweden reported high intensity; 24 Member States including the United Kingdom (Wales) reported medium intensity and 18 Member States including the United Kingdom (England, Northern Ireland and Scotland) low intensity.
Of the 46 Member States and areas reporting on geographic spread, 27 Member States reported widespread activity, while others reported regional (n=6 including the United Kingdom (Scotland)), local (n=6 including the United Kingdom (Wales)) or sporadic spread (n=6 including the United Kingdom (England and Northern Ireland)) and 3 reported no activity
Viruses detected in sentinel-source specimens (ILI and ARI)
For week 10/2018, 1 240 (50.6%) of 2 449 sentinel specimens tested positive for influenza viruses; 41% were type A and 59% were type B.
Of 362 subtyped A viruses, 73% were influenza A(H1N1)pdm09 and 27% A(H3N2). Of 406 type B viruses ascribed to a lineage, 97.5% were B/Yamagata and 2.5% B/Victoria.
Of 35 Member States across the region and the United Kingdom (England and Northern Ireland) that each tested at least 10 sentinel specimens in week 10/2018, 26 and the UK (England and Northern Ireland) reported proportions of influenza virus detections above 30% (range of 31% to 70%).
Overall, since week 40/2017, more influenza type B (66%) than type A (34%) viruses have been detected. Of 6 265 subtyped A viruses, 65% were A(H1N1)pdm09. The majority of type B viruses were reported without lineage, but of the 6 579 ascribed to a lineage, 97% were B/Yamagata.
Details of the distribution of viruses detected in non-sentinel-source specimens can be found in the virus characteristics section.