Recent research suggests that bird flu, or H5N1, could spread through the air via droplets of milk released during the milking process, posing a new threat to dairy farm workers.

Bird Flu Detected in Air on Dairy Farms

Bird flu, also known as H5N1, has been found in the air of milking rooms on California dairy farms during active outbreaks. This discovery raises concerns about the potential for airborne transmission, increasing the risk of human infection.

Traditional Transmission Routes

Typically, bird flu spreads through contact with saliva, mucus, and feces from infected birds or animals. It is commonly detected in unpasteurized milk and affects wild birds, domestic poultry, and dairy cows.

New Findings on Airborne Spread

Researchers found that the virus could be detected in the air of enclosed milking rooms, suggesting that airborne transmission through milk droplets is possible. This finding indicates that contact with birds and contaminated milk may not be the only ways the virus spreads.

Human Infections and Risks

Since 2024, 71 Americans have been infected with bird flu, including two deaths. The majority of these cases involved farm workers exposed to infected animals. The new research highlights the potential for airborne transmission to increase the risk of human infection.

Undetected Infections in Cows

The study also found that cows appearing healthy could still carry antibodies for H5N1, suggesting prior infections that were not detected by previous testing. This underscores the need for more extensive testing on farms to monitor the spread of the virus.

Call for Increased Testing

Scientists emphasize the importance of increased and more comprehensive testing for H5N1 on dairy farms to better understand and control the spread of the virus.