Bird flu spreads in California dairy herds with some human cases reported

Avian influenza is affecting dairy herds in California, with some human cases reported in North America. Recent research shows a mutation may help the virus infect human airways, but most infections remain mild and linked to close contact with infected animals. Experts say the current strain of bird flu primarily affects birds and does not easily infect humans. Most human cases in the U.S. are traced to direct contact with infected poultry or dairy cattle, keeping the risk low for the general public. The virus has also been found in dairy cattle, surprising scientists. Infections among dairy workers have occurred, likely from exposure to raw milk. Precautions for pets include supervising outdoor activities and avoiding contact with wild birds or contaminated food.