Overview

• H5N1 detected in dairy herds across nine US states, with Michigan reporting the highest number of infections.
• San Francisco finds bird flu in wastewater and live bird markets, prompting increased surveillance.
• Australia culls thousands of hens as H7N3 strain spreads to a third farm, threatening egg supplies.
• Three US dairy farm workers infected, with the latest case showing respiratory symptoms.
• Authorities prepare millions of vaccine doses as a precaution against potential human transmission.