Bird‑flu monitoring sharpens

Bird flu tracking is getting more precise as scientists map how ducks, geese and swans move between feeding and resting sites, not just on long migrations. (news.uga.edu) A University of Georgia team reported on April 7 that it analyzed 20 years of movement data from more than 4,600 waterfowl across 26 species in the Northern Hemisphere. The study found birds in large, uniform landscapes such as grasslands and farmland traveled about six times farther in daily routines than birds in mixed landscapes with wetlands and urban green space. (news.uga.edu) The researchers said those shorter daily trips in human-shaped landscapes could mean less geographic spread but denser local outbreak hotspots. Lead author Claire Teitelbaum of the United States Geological Survey’s Georgia Cooperative Fish and Wildlife Research Unit said environmental conditions can be used to estimate how much birds move and where avian influenza may go next. (news.uga.edu) Avian influenza is a family of flu viruses that circulates mainly in birds, and highly pathogenic H5N1 is the form that kills poultry quickly and has spread widely in wild birds. The Centers for Disease Control and Prevention said on March 6 that H5 bird flu remains widespread in wild birds worldwide and has also caused outbreaks in poultry and United States dairy cows. (cdc.gov) The same federal update said the current public health risk from H5 bird flu is low, with no known person-to-person spread, but it listed 71 human cases in the United States since February 2024 and two deaths. Most of those cases were tied to dairy herds, poultry farms, culling operations or other animal exposure. (cdc.gov) A separate World Health Organization update on April 10 focused on a different bird flu subtype, H9N2, after Italy notified the agency on March 21 about an infected adult man who had returned from Senegal. WHO said this was the first imported human H9N2 case reported in the European Region and kept its risk assessment for the general population at low. (who.int) WHO said the patient had fever and persistent cough, tested positive for unsubtypeable influenza A on March 16, and was later confirmed to have H9N2 by sequencing on March 21. Italian authorities isolated him, treated him with oseltamivir, traced contacts in Italy and Senegal, and reported that all identified contacts in Italy tested negative. (who.int) The European Centre for Disease Prevention and Control said on March 25 that this was the first human H9N2 case reported in the European Union and European Economic Area. It also said 195 human H9N2 cases had been reported worldwide since 1998 across 10 countries in Asia and Africa, with two fatal infections and no documented person-to-person transmission. (ecdc.europa.eu) Global animal health agencies are already treating wild-bird movement as a core part of H5N1 surveillance. A joint Food and Agriculture Organization, World Health Organization and World Organisation for Animal Health assessment published in July 2025 said 389 of 807 reported H5N1 animal outbreaks from March 1 to July 1, 2025 were in wild birds. (woah.org) The immediate picture is two-track: scientists are refining where bird outbreaks may flare next, while health agencies still see low risk of sustained spread in people. Both efforts depend on the same thing now—catching changes in animals before they become changes in humans. (news.uga.edu) (who.int)