Tracking the spread of bird flu
A new paper from an MIT-led team demonstrates that Alaska can offer a significant foothold for Asian flu viruses, enabling them to enter North America. The research also shows that the region serves as a fertile breeding ground for new flu strains. In 2014 and 2015, an outbreak of H5N8, H5N1, and H5N2 influenza affected poultry farms in North America, resulting in the culling of nearly 50 million chickens and turkeys. The new study finds that an epidemic flu strain, which originated in Southeast Asia, was most likely carried into Alaska by wild migratory birds. In Alaska, the viruses mingled with local flu strains and eventually evolved into the deadly strains that spread south to poultry farms in Washington, Oregon, and California. “We think there’s strong evidence that those viruses moved through the Bering strait through wild bird populations and began a process of evolution that ended up with them infecting poultry...