China reported two new human cases of H9N2 avian influenza in August 2026, one in Anhui Province and another in Beijing. Both patients had poultry exposure, and no further transmissions were detected.
The World Health Organization (WHO) confirmed two new human infections with the H9N2 avian influenza virus in China during August 2026. The first case involved a child under five years old in Anhui Province, who contracted the virus through exposure to a live poultry market and was hospitalized before recovery. The second case occurred in Beijing, where a pediatric patient also linked to poultry markets recovered fully. Neither case resulted in secondary infections among close contacts, according to the WHO report.
From 14 to 20 August 2026, one new case of human infection with avian influenza A(H9N2) virus was reported to WHO in the Western Pacific Region. The case is a male child under 5 years of age from Anhui Province, China, with symptom onset on 3 August 2026. The case was hospitalised and subsequently discharged. The case had exposure to live poultry market, and no additional cases were reported from close contacts. From 21 to 27 August 2026, one new case of human infection with avian influenza A(H9N2) virus was reported to WHO in the Western Pacific Region. The case is a pediatric patient from Beijing Province, China, with symptom onset on 15 August 2026. The case has since recovered. The case had exposure to live poultry market, and no additional cases were reported from close contacts.
Since 2015, a total of 179 cases of human infection with avian influenza A(H9N2), including two deaths (both with underlying conditions), have been reported to WHO in the Western Pacific Region. Of these, 176 were reported from China, two were from Cambodia, and one was from VietNam. Avian influenza subtype A(HxNy) normally spreads in birds but can also infect humans. Human infections are primarily acquired through direct contact with infected poultry or contaminated environments. While avian influenza viruses do not currently transmit easily from person to person, the ongoing circulation of these viruses in poultry is concerning, as these viruses can result in mild to severe illness and death, and also have the potential to mutate to become more contagious.
China reports two additional H9N2 avian influenza cases in
H9N2 Dominance in China’s Poultry Markets
A study analyzed avian influenza virus (AIV) subtypes across China from 2016 to 2019, revealing that H9N2 accounted for 72.75% of pure isolates during that period. This subtype was particularly prevalent, with proportions ranging from 57.69% (West) to 95.95% (East-Central) in the seven defined regions. The study also noted that H9N2 circulated alongside other subtypes like H5N6, H7N9, and H6N6, but remained the most dominant. These findings provide context for the recent cases, as H9N2’s persistence in live poultry markets (LPMs) underscores ongoing risks for human exposure.
The study sampled 16,091 poultry and environmental specimens across 37 cities, identifying 2,048 AIV-positive samples. H9N2 was isolated in 1,049 of these, with isolation rates higher in waterfowl (ducks and geese) than those of land poultry (chickens and pigeons), with ducks being the highest (17.88%) compared to chickens (12.47%). This pattern aligns with the recent cases, as both patients had contact with live poultry market—a known transmission route for avian influenza viruses.
The study further divided 23 provinces into seven regions: North, East-Central, South-Central, Yangtze River Delta, South-West, South, and West. The AIV positive rates in these regions were 5.01%, 9.50%, 20.48%, 20.83%, 8.11%, 8.80%, and 4.84%, respectively. Remarkably, aside from the East-Central region, the AIV positive rates in the other five regions (the North, South-Central, Yangtze River Delta, South-West, and South) substantially decreased during 2016–19 compared to those during 2014–16, especially in the South (from 32.40% to 8.80%) and South-West (from 31.78% to 8.11%) regions. However, the East-Central region maintained higher rates, suggesting localized challenges in controlling the virus.
Public Health Concerns and Surveillance Gaps
Dominant subtype switch in avian influenza viruses during 2016–2019
While avian influenza viruses can result in mild to severe illness and death, they also have the potential to mutate to become more contagious, raising public health alarms. The WHO report noted that since 2015, 179 human H9N2 cases have been documented in the Western Pacific Region, with two fatalities linked to underlying conditions. The study emphasized the need for sustained surveillance, as the virus’s circulation in poultry populations creates a reservoir for genetic changes. Officials in China have not yet commented on the recent cases, but the WHO has reiterated the importance of monitoring avian influenza strains for pandemic preparedness.
The study also highlighted geographic disparities in AIV prevalence. The South and South-West regions saw significant declines in positive rates, from 32.40% to 8.80% and 31.78% to 8.11%, respectively. However, the East-Central region maintained higher rates, suggesting localized challenges in controlling the virus. These regional variations may inform targeted interventions, though the recent cases in Anhui and Beijing indicate that H9N2 remains a persistent threat in certain areas.
What Comes Next for H9N2 Surveillance?
Public health officials face a critical question: will the cases signal a resurgence of H9N2 or remain isolated incidents? The lack of reported additional cases from close contacts in the recent cases is reassuring, but the ongoing circulation of these viruses in poultry is concerning. The study’s data on subtype dynamics could help predict future trends, but real-time surveillance is essential. As China’s poultry markets continue to be a hotbed for AIV activity, the next phase of monitoring will determine whether these cases are an anomaly or the start of a broader pattern.
Readers should note that while the recent cases highlight ongoing risks, no evidence of sustained human-to-human transmission has been reported. The WHO advises continued monitoring of avian influenza strains and emphasizes the importance of avoiding direct contact with live poultry to reduce infection risks. Individuals with symptoms following poultry exposure should consult qualified healthcare professionals for evaluation and guidance.