Update on CDC’s Avian Influenza A(H5N1) “Bird Flu” Response Activities June 21, 2024

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Includes info on A(H5N1) receptor binding findings, a new table categorizing degree of risk based on exposure, and more

June 21, 2024

	Influenza (Flu) 2023 - 2024 Flu Season

www.cdc.gov/flu

Update on CDC’s Avian Influenza A(H5N1) “Bird Flu” Response Activities CDC’s response to the outbreak of A(H5N1) bird flu in dairy cows most recently includes an update on the number of people being monitored and tested for A(H5N1) bird flu in the United States. The number of human cases reported with this outbreak is still three, while nearly 700 people have been monitored and more than 50 people tested. There is also an update on continued efforts to protect farm workers, including outreach via social media in affected counties. Learn More

New CDC Table of Risk Assessment for A(H5N1) Virus infection A new appendix to CDC’s A(H5N1) guidance categorizes the degree of risk for infection among people at higher risk of exposure based on specific settings (e.g. farms, slaughterhouses) and activities (e.g. milking cows). The highest risk is from direct, unprotected contact with infected animals or their environments and exposure to contaminated raw cow’s milk. These risk categories will be refined as additional data become available. Learn More

CDC Study Shows A(H5N1) Virus from Human Case in Texas Not Well Adapted to Infect People A new CDC analysis of A/Texas/37/2024 looked at the virus’s hemagglutinin (HA) surface protein, the part of the virus that allows it to attach to host cells and cause an infection. Preliminary results indicate that the hemagglutinin of the virus preferentially binds to avian-type receptors, not to human-type receptors, which suggests that this virus is not well adapted to infect people.

	X @CDCFlu Farm workers: If you work with dairy cows or other animals that could be infected with #H5N1 #birdflu, you can take actions to reduce your risk of infection. Read more here:  https://bit.ly/3XtcLYo

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