北半球/温暖地域（ヨーロッパ）

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直近の過小評価に注意

In Europe, overall influenza activity continued to increase with influenza positivity from sentinel sites increasing to 37% in week 51,
above the 10% epidemic threshold. Both influenza A and B viruses were detected with influenza A(H3N2) predominating among
the subtyped viruses across sentinel sites but with differences among regions: influenza A(H1N1)pdm09 predominated in Eastern
Europe, influenza A(H3N2) in South West Europe, while Northern Europe reported equal proportions of influenza A(H1N1)pdm09
and A(H3N2) detections. Half (19/40) of reporting countries signaled high or very high influenza intensity and more than half
(24/40) of countries reported widespread activity. The proportion of sentinel specimen testing positive for influenza was higher than
the proportion testing positive for SARS-CoV-2 (37% versus 10%). Hospitalizations for SARI and influenza-confirmed
hospitalizations increased in most European countries. In France, the proportion of hospital and intensive care unit (ICU)
admissions for influenza reached very high levels. In Germany, the number of SARI cases remained at a very high level, with 28%
of SARI patients testing positive for influenza (and 11% for SARS-CoV-2). In England, United Kingdom of Great Britain and
Northern Ireland (United Kingdom), the influenza hospital admission rate reached a very high level and the influenza ICU or High
Dependency Unit admission rate was at a medium level — both surpassing the COVID-19 rates. RSV positivity decreased to
expected levels for this time of year. Bronchiolitis continued to be reported at high but decreasing levels in Belgium, France,
Germany and England, United Kingdom. Pooled all-cause mortality estimates from the EuroMomo network showed elevated
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excess mortality across some age-groups and a substantial increase in excess mortality among persons
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aged 45 years and older.