全球呼吸道病毒活动：每周更新N°569

GLOBAL INFLUENZA SURVEILLANCE AND RESPONSE SYSTEM (GISRS) Co-circulationInfluenzaSARS-CoV-2RSVSeverity assessment SUMMARY Globally, influenza positivity was below 10% in week 10 2026. SARS-CoV-2 activity remained low overall. Influenza predominated and positivity was justbelow 10% in the northern hemisphere temperate and subtropical areas and in tropical areas. In the southern hemisphere temperate and subtropical areas,influenza and SARS-CoV-2 positivity were both low. Globally, RSV positivity remained stable and low. [Figures 1a, 1b, 1c and 1d] Globally, RSV positivityremained stable and low. qInfluenza Globally, influenza detections continued to decline in week 10 with the number of influenza A and B virus detections in similar proportions. [Figure 2] In the northern hemisphere, influenza percent positivity was elevated (>10%) in countries in North America, Western Africa and Southern Asia.Percent positivity was over 30% in countries in Central America and the Caribbean, Europe and South-East and Eastern Asia. Increases in activity wereobserved in a few countries in Central America and the Caribbean and in single countries in Western Africa, Western and Southern Asia. [Figures 3 and 4] In the southern hemisphere, influenza activity remained low overall although elevated positivity (>10%) was reported in a few countries in TropicalSouth America and in single countries in Temperate South America and South-East Asia. A small increase in activity was observed in a single countryin Tropical South America. [Figures 3 and 4] In the zones with elevated positivity, influenza A(H3N2) was predominant in most of the zones except Central America and the Caribbean, SouthWest Europe and Southern Asia where influenza A(H1N1)pdm09 and A(H3N2) were codominant, North America where influenza A(H3N2) and Bwere codominant and Western Africa where influenza B was dominant. [Figures 5 and 6] qSARS-CoV-2Globally, SARS-CoV-2 positivity remained stable and low, with single countries reporting elevated positivity (>10%) in Northern Europe and Temperate South America. A small increase in activity was reported in a single country in Western Asia. [Figures 7 and 8] qRespiratory Syncytial Virus (RSV)Globally, RSV positivity remained stable and low, with a few countries reporting elevated positivity (>10%) in Europe and Western Asia. Percent positivity was over 30% in one country in Northern Africa. Small increases in activity were reported in single countries in Tropical South America,Northern and Eastern Africa and Northern Europe and a few countries in South West and Eastern Europe. [Figures 9 and 10] RSV and influenzaactivity were both elevated in countries in South West and Northern Europe. qSeverity assessmentThe severity assessments here are reported from countries, areas and territories. Assessments for transmissibility can be reported based on syndromic parameters and/or influenza-specific parameters. In the northern hemisphere temperate and subtropical areas, influenza-specific transmissibility wasreported as low (1); transmissibility using syndromic data was reported as below seasonal threshold (23), low (6) and moderate (4). [Figures 11 and 12] Co-circulation of influenza and SARS-CoV-2 1c) Weekly numbers of influenza andSARS-CoV-2 virus specimens tested andpercent positivity in tropical areas 1d) Weekly numbers of influenza andSARS-CoV-2 virus specimens tested andpercent positivity in southern hemispheretemperate and subtropical areas 1b) Weekly numbers of influenza andSARS-CoV-2 virus specimens tested andpercent positivity in northern hemispheretemperate and subtropical areas Influenza 3) Proportions of specimens that tested positive forinfluenza (year-week:2026-10) 4) Change in proportions of specimens that testedpositive for influenza (year-week:2026-10) 6) Weekly distribution of influenza virus types andsubtypes by geographic zone (last 12 months) 5) Proportions of influenza virus types and subtypes byinfluenza transmission zones (year-week:2026-10) SARS-CoV-2 7) Proportions of specimens that tested positive forSARS-CoV-2 (year-week:2026-10) 8) Change in proportions of specimens that testedpositive for SARS-CoV-2 (year-week:2026-10) Respiratory syncytial virus 9) Proportions of specimens that tested positive for RSV(year-week:2026-10) 10) Change in proportions of specimens that testedpositive for RSV (year-week:2026-10) Severity assessment 12) Syndromic transmissibility (year-week:2026-10) 11) Influenza specific transmissibility (year-week:2026-10) 13) Number of countries, areas or territories reporting to FluNet (from year-week2026-06to year-week2026-10) Additional information Data and methodsThe data presented in this report originates from virologic surveillance conducted by countries, areas, and territories (CATs) and submitted to WHO FluNet through participation or collaboration with the Global Influenza Surveillance and Response System (GISRS). These CATs employ diverse methodolo