Primary care data
All countries reported activity of respiratory infections below threshold levels, where thresholds existed, based on syndromic surveillance data for influenza-like illness (ILI) and/or acute respiratory infection (ARI).
All 37 Member States and areas reporting on intensity reported low intensity.
Of the 36 Member States and areas reporting on geographic spread, 19 reported no activity, 15 sporadic and 2 (Sweden and the United Kingdom (Scotland)) reported local activity.
Viruses detected in sentinel-source specimens (ILI and ARI)
For week 20/2018, 7 (3%) of 229 sentinel specimens tested positive for influenza viruses; 4 were type A and 3 were type B (Table).
Of 7 countries across the region that each tested at least 10 sentinel specimens in week 20, none reported a rate of influenza virus detections above 8%.
Of 3 subtyped A viruses, 2 were A(H1N1)pdm09 and 1 A(H3N2). No type B viruses were ascribed to a lineage (Figure and Table).
For the season overall, more influenza type B (63%) than type A (37%) viruses were detected, although between weeks 40/2017 and 44/2017 and since week 12/2018 the proportion of type A viruses detected has been higher than that of type B viruses. Of 7 689 subtyped A viruses, 65% were A(H1N1)pdm09. The majority of type B viruses were reported without lineage, but of the 7 513 ascribed to a lineage, 97% were B/Yamagata (Table).
Details of the distribution of viruses detected in non-sentinel-source specimens can be found in the Virus characteristics section.