直近の過小評価に注意

北半球/温暖地域
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In the countries of North America, influenza
activity increased steeply in recent weeks and
early compared to previous seasons. In
Canada, ILI activity increased above the
seasonal average for this time of year.
Influenza percent positivity increased above
the seasonal threshold. Influenza-associated
pediatric hospitalizations were well above
average for this time of year. In the U.S., ILI
continued to increase well above the national
baseline with an increase observed in all age
groups. An early increase in influenza activity
compared to previous seasons was reported.
Cumulative influenza hospitalizations to date
were greater compared to the same data for
In Europe, overall influenza activity remained low but with an increasing trend. Influenza A(H3N2)
predominated among the subtyped influenza A viruses, with some detections of A(H1N1)pdm09 and past seasons since 2010-11. The percentage
B viruses. Activity remained highest in Southwest Europe (3.62% positivity) where Germany, Portugal, of deaths attributed to pneumonia, influenza
and Spain reported an increasing trend in activity, with widespread activity in Portugal. Germany and or COVID-19 in the U.S. remained above the
epidemic threshold established from historical
Spain reported influenza positivity above the 10% epidemic threshold. Malta reported high-intensity
activity with local spread. RSV activity was very high and increasing in France, high and increasing in data, with the majority of recent mortality
attributed to COVID-19. In both countries,
Ireland and moderate but decreasing in the United Kingdom. Pooled all-cause mortality estimates
from the EuroMomo network continued to show increased excess mortality across most age groups. several respiratory viruses were co-circulating.
Influenza A viruses predominated and
A(H3N2) viruses accounted for the majority of
subtyped influenza A viruses. RSV activity
increased further in both countries and was
above average levels for this time of year in
Canada.

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