Primary care data

Influenza activity

For weeks 30–34/2017, 22 to 26 countries reported weekly epidemiological data. All reporting countries reported low intensity of influenza activity for the entire period. European intensity of influenza activity and geographic spread data are shown for week 34/2017.

 

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

For weeks 30–34/2017, 2 (<1%) of 225 sentinel specimens tested positive for influenza viruses. Both were type A viruses and one was subtyped as A(H3N2).

 

Table. Influenza virus detections in sentinel-source specimens by type and subtype, cumulatively for weeks 30-34/2017

Virus type and subtype

Weeks 30-34/2017

Number

%a

Influenza A

 2

100

A(H1N1)pdm09

 0

0

A(H3N2)

 1

100

A not subtyped

 1

-

Influenza B

0

0

B/Victoria lineage

 0

0

B/Yamagata lineage

 0

0

Unknown lineage

 0

-

Total detections / Total tested

2/225

<1


 a
For influenza type percentage calculations, the denominator is total detections; for subtype and lineage, it is total influenza A subtyped and total influenza B lineage determined, respectively; for total detections, it is total tested.