【世界卫生组织-2025研报】Influenza Update N° 520.pdf

GlobalRespiratoryVirusActivityWeeklyUpdateN°520

SummarizingdatathroughWeek12,ending23March2025

Summary

Influenza

•IntheNorthernhemisphere,activitycontinuedtodeclineorremainedthesameinmostcountries.MinorincreasesinactivitywerereportedinafewcountriesinCentral

AmericaandCaribbean,SouthwestandEasternEurope,andWestern,SouthernandSouth-EastAsia.Influenzapositivityremainedelevated(10%)intheAmericas

(predominantlyA(H1N1)pdm09andA(H3N2)),Western(predominantlyA(H1N1)pdm09)andNorthernAfrica(predominantlyA(H3N2)andBviruses),Southwestand

NorthernEurope(AandBvirusesinsimilarproportions),EasternEurope(predominantlyBviruses),WesternandSouthernAsia(predominantlyA(H3N2)andBviruses),

CentralAsia(predominantlyBviruses)andSouth-EastAsia(predominantlyA(H1N1)pdm09).

•IntheSouthernhemisphere,activityremainedthesameordecreasedinallcountries.InfluenzapositivityremainedelevatedinafewcountriesinTropicalSouthAmerica,

EasternAfrica(predominantlyAviruseswithA(H1N1)pdm09andA(H3N2)inequalproportions),South-EastAsiaandOceania(predominantlyA(H1N1)pdm09).

SARS-CoV-2

•Globally,activitycontinuedtobelowacrossreportingcountriesexceptforafewcountriesinTemperateSouthAmericaandWesternAfricawherepositivityremained

elevated(10%)andincreasedsincethelastreport.

InfluenzaactivitySARS-CoV-2activity

ProportionofspecimenstestingpositiveforinfluenzaProportionofspecimenstestingpositiveforSARS-CoV-2

Changeinproportionofspecimenstestingpositiveforinfluenza