CDC Week 43 FluView: 8,396 Laboratory-Confirmed Hospital Admissions in the Week Ending October 31, at Least 1.7 Million Illnesses This Season, With H1N1 at 97.7% of Subtyped Viruses
WASHINGTON — Seasonal flu activity continues to increase in many parts of the United States and is higher than typically observed at this time of year, according to the Centers for Disease Control and Prevention's (CDC) FluView report for Week 43, the week ending October 31, 2026. The CDC notes that an earlier increase in activity does not necessarily lead to a higher seasonal peak or greater overall severity. All figures are preliminary and may change as more reports are received.
On laboratory measures, clinical laboratories tested 51,351 respiratory specimens in Week 43, with 4,696 positive (9.1%), of which 98.6% were influenza A. Public health laboratories reported 513 viruses — 502 influenza A and 11 influenza B — and of the 388 subtyped influenza A viruses, 379 (97.7%) were A(H1N1)pdm09, 7 were A(H3N2) and 2 were influenza A(H5). Outpatient visits for influenza-like illness were 2.8% nationally, below the 2.9% national baseline. Hospitals reporting to the National Healthcare Safety Network recorded 8,396 laboratory-confirmed influenza admissions in Week 43, a rate of 2.5 per 100,000 people, while FluSurv-NET's cumulative hospitalization rate was 6.0 per 100,000, highest among adults aged 65 and older at 19.8 per 100,000.
The CDC estimates there have been at least 1,700,000 illnesses, 25,000 hospitalizations and 1,400 deaths from flu so far this season, and three influenza-associated pediatric deaths occurring during the 2026-27 season have been reported. The report also records two confirmed human infections with avian influenza A(H5) virus reported that week, including one death, both in Washington State dairy farm workers; human-to-human transmission of A(H5) virus has not been identified in the United States. CDC's FluSight forecasts predict a likely increase in flu hospital admissions for the week ending November 21, ranging from 6,900 to 30,100 admissions, with flu accounting for 1.6% to 6.7% of emergency department visits. The CDC states that flu vaccination is recommended for persons aged 6 months and older and encourages those not yet vaccinated this season to be vaccinated. This report presents official surveillance facts and resources only and offers no individual medical advice.
Source: Centers for Disease Control and Prevention
Published by GSM · USA (original Chinese edition)
Photo: 图：甲型流感病毒透射电镜图。（美国疾控中心，公共领域，经 Wikimedia Commons） / Photo: Transmission electron micrograph of influenza A virus. (CDC, public domain, via Wikimedia Commons)
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