First pediatric flu death of the 2026-27 season

The first influenza-associated pediatric death of the 2026-2027 season has been reported to the CDC, as multiple surveillance indicators show flu activity rising earlier than usual.¹ The child died during the week ending October 10 from an illness associated with influenza A(H1N1); FluView did not include the child's age, location, or vaccination status.¹

Local health departments have also begun reporting pediatric deaths. San Bernardino County, California, announced on October 30 the flu-related death of a child with underlying medical conditions who was too young to receive influenza vaccine.² County Health Officer Sharon Wang called the loss "a devastating reminder of how serious respiratory viruses can be."² Colorado confirmed its first pediatric flu-associated death of the season in mid-October, in an elementary school–aged child living outside the Denver metro area.³ It is not clear whether either case is the death counted nationally.

Pediatric flu deaths in the 2026-27 and 2025-26 seasons

CDC defines an influenza-associated pediatric death as 1 in a person younger than 18 years resulting from a clinically compatible illness confirmed as influenza by laboratory testing, with no period of complete recovery between illness and death.¹ Because case investigations take time, deaths are often reported weeks after they occur.¹

Two pediatric deaths were reported to CDC during the week ending October 24. Alongside the first 2026-2027 death, a late-reported death associated with influenza B, which occurred in September, brought the 2025-2026 pediatric total to 199.¹

Early H1N1 activity drives 2026-27 flu surveillance indicators

Seasonal activity remains low nationally, but indicators have been rising since late August and are higher than typical for this point in the year.¹ During the week ending October 24, 7.6% of 53,102 specimens tested in clinical laboratories were positive for influenza, and 98.9% of influenza A viruses subtyped by public health laboratories were A(H1N1)pdm09.¹ Outpatient visits for influenza-like illness reached 2.4%, still below the national baseline of 2.9%, with increases among patients aged 0 to 4 and 5 to 24 years.¹

Pediatric flu hospitalizations and emergency department visits

The share of emergency department visits with an influenza diagnosis rose among patients aged 0 to 4 and 5 to 17 years.¹ Hospitals reported 6,100 laboratory-confirmed flu admissions for the week, and children aged 0 to 4 years had the second-highest admission rate (1.8 per 100,000) after adults 65 years and older.¹

In the FluSurv-NET network, the weekly hospitalization rate was the highest for this point in the season since 2010-2011.¹ Cumulative rates were 3.2 per 100,000 among children aged 0 to 4 years and 1.0 per 100,000 among those aged 5 to 17 years.¹ CDC estimates at least 1 million illnesses, 16,000 hospitalizations, and 900 deaths from flu so far this season, and FluSight forecasts project 4,800 to 23,200 flu admissions for the week ending November 14.¹

H1N1 subclade diversity, vaccine match, and antiviral susceptibility

Most circulating H1N1 viruses belong to the D.3.1.1 hemagglutinin subclade, and CDC reports more genetic diversity among co-circulating A(H1N1)pdm09 viruses than it has previously observed.¹ The agency says it is too early to know whether this will affect vaccine effectiveness. Early antigenic data are reassuring: 94.2% of 103 characterized H1N1 viruses were well recognized by antisera to the 2026-2027 vaccine reference virus.¹

On treatment, 8 of 354 H1N1 viruses tested (2.3%) showed reduced inhibition by oseltamivir, none showed highly reduced inhibition, and no viruses had decreased susceptibility to baloxavir.¹ CDC recommends annual vaccination for everyone 6 months and older, urging those not yet vaccinated to do so now, and early antiviral treatment, particularly for patients at higher risk of complications.¹ Because infants younger than 6 months cannot be vaccinated, their protection depends on vaccinated caregivers and household contacts.²

References

1. Centers for Disease Control and Prevention. Weekly US influenza surveillance report: key updates for week 42, ending October 24, 2026. FluView. Published October 30, 2026. Accessed November 2, 2026. https://www.cdc.gov/fluview/surveillance/2026-week-42.html

2. Ferrara JR. Child dies of flu-related illness in San Bernardino County. KTLA. Published October 30, 2026. Accessed November 2, 2026. https://ktla.com/news/inland-empire/child-dies-of-flu-related-illness-in-san-bernardino-county/

3. Scripps News Group. Colorado confirms pediatric flu death as cases rise early this season. KKTV. Published October 16, 2026. Accessed November 2, 2026. https://www.kktv.com/2026/10/16/colorado-confirms-pediatric-flu-death-cases-rise-early-this-season/