Bird Flu Cases Surge Among US Poultry Workers Amid Heat Wave

Five workers in Colorado have been infected with the H5N1 avian influenza virus, which is suspected to have spread from dairy cows to chickens and then to humans. The infections occurred during the culling of infected chickens, with high temperatures making it difficult for workers to use protective gear. The CDC and USDA are investigating the outbreak, which has significantly increased the number of human cases linked to the virus. There is no evidence of human-to-human transmission, but the virus has been found in milk from infected cows.