Table 2. Antigenic and genetic characteristics of influenza viruses as reported to TESSya by week of sampling, WHO European Region, week 40 2021–week 4 2022 (n = 987 characterisations).
| Year Week |
ANTIGENIC | TOTAL | GENETIC | TOTAL | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AH1/ Guangdong-Maonan/ SWL1536/ 2019b |
AH1/ Victoria/ 2570/ 2019c,d,e |
AH3/ Cambodia/ e0826360/ 2020d |
AH3/ Darwin/ 9/ 2021e |
AH3 no cat |
BVic/ Austria/ 1359417/ 2021e |
BVic/ Brisbane/ 60/ 2008 |
AH1 subgroup not listed |
AH3 subgroup not listed |
BYam/ Phuket/ 3073/ 2013_ Clade 3f |
BVic/ Washington/ 02/ 2019_ 1A.3b,c,d |
AH1/ Guangdong-Maonan/ SWL1536/ 2019_ 6B.1A.5a.1b |
AH1/ Victoria/ 2570/ 2019_ 6B.1A.5a.2 c,d,e |
AH1 no clade |
AH3/ Denmark/ 3264/ 2019_ 3C.2a1b.1a |
AH3 no clade |
BVic no clade |
BYam no clade |
AH1/ India/ Pun-NIV312851/ 2021_ 6B.1A.5a.2 |
AH3/ Bangladesh/ 4005/ 2020_ 3C.2a1b.2a.2 |
AH3/ Cambodia/ e0826360/ 2020_ 3C.2a1b.2a.1 d |
BVic/ Austria/ 1359417/ 2021 _1A.3a.2 e |
||||
| 2021 | |||||||||||||||||||||||||
| 40 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18 | 0 | 0 | 18 | |
| 41 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 32 | 0 | 0 | 36 | |
| 42 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 2 | 0 | 39 | 0 | 0 | 43 | |
| 43 | 0 | 0 | 4 | 1 | 0 | 0 | 0 | 5 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 48 | 0 | 0 | 56 | |
| 44 | 0 | 0 | 8 | 1 | 0 | 1 | 0 | 10 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 33 | 0 | 0 | 38 | |
| 45 | 0 | 0 | 12 | 1 | 0 | 0 | 0 | 13 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 43 | 0 | 1 | 47 | |
| 46 | 0 | 0 | 15 | 1 | 0 | 0 | 0 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 0 | 0 | 0 | 49 | 1 | 0 | 54 | |
| 47 | 0 | 0 | 11 | 2 | 1 | 0 | 1 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 67 | 0 | 1 | 71 | |
| 48 | 0 | 0 | 11 | 6 | 0 | 1 | 0 | 18 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 2 | 0 | 0 | 0 | 52 | 0 | 0 | 56 | |
| 49 | 1 | 0 | 6 | 8 | 0 | 0 | 0 | 15 | 1 | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 12 | 0 | 0 | 0 | 69 | 0 | 0 | 86 | |
| 50 | 0 | 0 | 3 | 1 | 2 | 0 | 0 | 6 | 2 | 0 | 0 | 0 | 2 | 0 | 0 | 1 | 6 | 0 | 0 | 0 | 104 | 0 | 1 | 116 | |
| 51 | 1 | 0 | 4 | 0 | 0 | 0 | 0 | 5 | 1 | 0 | 0 | 0 | 5 | 0 | 1 | 2 | 20 | 0 | 0 | 0 | 58 | 0 | 2 | 89 | |
| 52 | 0 | 0 | 6 | 1 | 0 | 0 | 0 | 7 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 1 | 2 | 0 | 0 | 0 | 52 | 0 | 0 | 60 | |
| 2022 | |||||||||||||||||||||||||
| 1 | 0 | 0 | 9 | 0 | 5 | 0 | 0 | 14 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 17 | 0 | 0 | 27 | |
| 2 | 0 | 0 | 5 | 2 | 0 | 0 | 0 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17 | 0 | 0 | 1 | 12 | 0 | 0 | 30 | |
| 3 | 0 | 1 | 4 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 3 | 0 | 0 | 14 | |
| 4 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | |
| ALL | 2 | 1 | 106 | 24 | 8 | 2 | 1 | 144 | 4 | 0 | 4 | 2 | 22 | 2 | 4 | 7 | 86 | 1 | 3 | 6 | 696 | 1 | 5 | 843 | |
No cat.: no category; TESSy: The European Surveillance System; WHO: World Health Organization.
a Antigenic and genetic characteristics of influenza viruses are shown in the Table as reported to TESSy (in both aggregated and strain-based reports) by week of sampling. When both record types are reported from same data source and week, only strain-based reports are considered.
b WHO recommended vaccine viruses for the 2020/21 northern hemisphere influenza season (trivalent vaccines).
c WHO recommended vaccine viruses for the 2021 southern hemisphere influenza season (trivalent vaccines).
d WHO recommended vaccine viruses for the 2021/22 northern Hemisphere influenza season (trivalent vaccines).
e WHO recommended vaccine viruses for the 2022 southern hemisphere influenza season (trivalent vaccines).
f WHO recommended B/Yamagata-lineage vaccine virus for all four seasons (quadrivalent vaccines).
No cat.: not attributed to a predefined TESSy antigenic category. No clade: not attributed to a predefined TESSy genetic clade.