Update on CDC’s Avian Influenza A(H5N1) “Bird Flu” Response Activities July 19, 2024

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Includes info on the Michigan-led seroprevalence study in farmworkers, genetic sequencing of the virus from a human case in Colorado, and more.

July 19, 2024

	Influenza (Flu) 2023 - 2024 Flu Season

www.cdc.gov/flu

Update on CDC’s Avian Influenza A(H5N1) “Bird Flu” Response Activities CDC continues to respond to the outbreak of HPAI A(H5N1) bird flu in dairy cows in the United States. Recent CDC activities include reporting key findings of the Michigan-led study of blood samples collected from workers at dairy farms that experienced an outbreak of A(H5N1) virus among cattle; an analysis of the genetic sequence of the virus isolated from one of the Colorado poultry farm workers recently diagnosed with H5N1 infection; and confirmation of two additional cases of avian influenza in Colorado poultry farm workers. Learn More

Michigan H5N1 Seroprevalence Study Suggests No Previous Infections As part of an ongoing study led by the Michigan Department of Health and Human Services, CDC analyzed sera (blood) collected in June from 35 people who worked with Michigan dairy cow herds that were infected with HPAI A(H5N1) clade 2.3.4.4b viruses. None of the 35 people showed antibodies to the virus, indicating that there have been no previous infections in the study population. Consistent with other data, the findings suggest the seroprevalence to HPAI A(H5N1) viruses, even among workers with known exposures, is low.

CDC Posts Sequencing Data From Infected Poultry Farm Worker in Colorado CDC posted the full sequence of the influenza virus genome from one patient infected with HPAI A(H5N1) virus on a poultry farm in Colorado, to GISAID and GenBank, confirming that the virus is from clade 2.3.4.4b. An analysis of the sequence indicates that the virus is closely related to the virus isolated from the first human case in Michigan and that it does not have changes associated with antiviral resistance. The analysis supports CDC's conclusion that the human health risk currently remains low.

	X @CDCFlu It’s rare, but #H5N1 #birdflu can infect people. Take precautions working with poultry, dairy cows, or unpasteurized (raw) milk. Find out how you can reduce your risk if you work around animals that could be infected at https://bit.ly/45CwdUl

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