Swaminathan warns H5N1 pandemic threat

Dr. Soumya Swaminathan, the former World Health Organization chief scientist, said this month that H5N1 bird flu is the pandemic threat she worries about most if the virus acquires efficient human-to-human transmission. Her comments, first reported by News18 on May 16 and then picked up by the Daily Star on May 18, did not announce a new outbreak or a change in official risk guidance. U.S. and international health agencies still say the current risk to the general public is low, while continuing to track animal outbreaks and sporadic human infections. The gap between those two facts — an expert warning about pandemic potential and official guidance that current public risk is low — is the central point readers need to understand. ### What exactly did Swaminathan say? News18 reported on May 16 that Swaminathan said “the influenza viruses are actually number one on the list of viruses that pose pandemic threats,” adding that H5N1 is “very worrying” because human infections have historically had high mortality. She said that if the virus adapts to spread efficiently among people, it “could be a pandemic that’s much worse than the coronavirus pandemic.” The Daily Star’s Monday story appears to have been a follow-on report based on those remarks rather than a report of a new epidemiological event. (news18.com) Her comparison with COVID-19 was about potential severity if the virus changes, not a statement that H5N1 is already spreading widely among humans. News18 quoted her as saying the concern is that cross-species spread into mammals shows the virus is adapting in ways that warrant close surveillance and more research on vaccines and treatments. (news18.com) ### Why do experts keep focusing on H5N1? WHO says influenza viruses at the human-animal interface require repeated reassessment because they evolve continuously in animal populations. The agency maintains a dedicated H5N1 risk-assessment page and has continued to publish 2026 updates on zoonotic influenza threats. (news18.com) CDC said on March 6 that H5 bird flu is widespread in wild birds worldwide and is causing outbreaks in poultry and U.S. dairy cows, with sporadic human cases in dairy and poultry workers. That animal spread matters because each infection in a new host gives the virus more opportunities to change. Swaminathan made the same point in her interview, saying spread into mammals raises concern about further mutations that could eventually support human transmission. (who.int) ### If the risk is serious, why do agencies still say the public risk is low? CDC’s current U.S. assessment says there is no known person-to-person spread at this time and that the public health risk is low. The agency’s national summary lists 71 human cases in the United States since February 2024 and two deaths, with most infections tied to dairy herds or poultry operations. (cdc.gov) ECDC said in a late-April 2026 monitoring update that WHO had reported a fatal H5N1 case in a child in Bangladesh, but no new cases were detected among close contacts. ECDC said that, since 2003, 998 confirmed human H5N1 cases and 478 deaths have been reported worldwide, and that its risk assessment for the general population in the EU/EEA remained low. (cdc.gov) ### So what is the real distinction between “low current risk” and “high pandemic potential”? WHO and CDC are describing two different things. Current risk refers to what is happening now: limited human infections, mostly linked to animal exposure, and no known sustained person-to-person spread. Pandemic potential refers to what could happen if the virus acquires mutations that let it spread efficiently among humans. (ecdc.europa.eu) Swaminathan’s warning sits in that second category. It is a forward-looking assessment of what H5N1 could become, based on the virus’s spread across species and the historical severity of human cases, rather than evidence that a human pandemic has already begun. (who.int) ### What should readers watch next? CDC said it now folds routine H5 bird flu updates into its broader influenza surveillance system and will continue to post any additional human cases. WHO is continuing its periodic influenza-at-the-human-animal-interface assessments, which are the clearest place to watch for any change in official risk language or evidence of human-to-human spread. (cdc.gov) (news18.com)