Cambodia Reports 12th Human H5N1 Case in 2025 as Global Health Experts Warn of Evolving Viral Threat
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Cambodia Reports 12th Human H5N1 Case in 2025 as Global Health Experts Warn of Evolving Viral Threat
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First, concern in Cambodia continues as the Ministry of Health announced its 12th confirmed human H5N1 infection this year. The latest case is a five-year-old boy from Kampot province who remains hospitalized in intensive care. Investigators link his infection to regular contact with sick backyard chickens. Cambodia has seen an unusual surge in cases recently, with 9 reported since early June. The World Health Organization reports that of the 27 Cambodian cases since the virus resurfaced last year, 12 have been fatal, and most are pediatric. Health officials emphasize that close contact with infected poultry remains the primary source of transmission in the region, and a novel reassortant strain is circulating that could complicate control efforts.
Second, in the United States, no new human H5N1 cases have been reported today, maintaining the total at three for the year. For comparison, 67 cases were recorded in 2024, so numbers remain much lower in 2025 so far according to Johns Hopkins University. The Centers for Disease Control maintains that the current public health risk in the United States is low but continues to monitor individuals exposed to infected animals, particularly in agricultural settings.
Third, global surveillance continues amid ongoing outbreaks in wild birds and sporadic cases in poultry workers. The World Health Organization’s latest report notes that since January, 11 laboratory-confirmed human H5N1 infections have occurred in Cambodia, part of a global total nearing 1,000 since tracking began. The current H5N1 viruses circulating in birds and poultry are genetically distinct from earlier strains, raising concern about potential crossover events.
Case Update:
No new human H5N1 cases have been reported in the U.S. since yesterday, keeping the 2025 total at three. Cambodia’s tally, however, climbed by one in the past 24 hours. The global case count remains relatively stable, but health authorities continue to emphasize the importance of vigilant surveillance.
New Guidance:
The CDC reiterated yesterday that H5N1 data in the U.S. will be reported monthly as part of its routine influenza updates. The World Health Organization continues to classify the risk to the general public as low, though occupational exposure poses a low to moderate risk depending on biosecurity practices. The agency encourages all states to immediately notify WHO of any confirmed human infection with novel influenza subtypes.
Expert Interview:
Earlier today, Dr. Lina Chen, an infectious disease epidemiologist with Johns Hopkins University, weighed in: “While the number of U.S. cases remains very low, the spike in Cambodian pediatric infections is a reminder that the virus is adapting regionally. We must stay alert, invest in surveillance, and maintain strong biosecurity for farms and markets.”
Looking Ahead:
Tomorrow, global health authorities will further assess the trend in Cambodian case clusters and monitor for new reports in Southeast Asia. The CDC is expected to reiterate updated reporting practices as part of its regular monthly surveillance, and there is anticipation of a World Health Organization technical update on viral genetic sequencing as the situation evolves.
Thank you for joining Bird Flu Bulletin: Daily H5N1 Update. Please tune in next week for more essential updates. This has been a Quiet Please production, and for me, check out Quiet Please Dot A I.
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