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{Excerpts} (...) Epidemiology Updates As of February 24, CDC has confirmed three human cases of H5 bird flu in people who became ill in 2025:  -- a dairy worker with exposure to infected dairy cows (Nevada),  -- a poultry worker with exposure to infected commercial poultry ( Ohio ), and  -- the owner of an infected backyard poultry flock ( Wyoming ).  These are all considered higher-risk exposures . While the dairy worker was not hospitalized , both people with poultry exposures experienced severe illness and were hospitalized . Both hospitalized cases were confirmed positive from lower respiratory specimens , including a bronchoalveolar lavage and sputum . To date, there has been no evidence of onward spread from any of these people to anyone else . The dairy worker in Nevada had conjunctivitis (eye redness and irritation) and has recovered . Most infections associated with U.S. dairy cows to date have involved mild respiratory symptoms or conjunctivitis. This perso...

{Excerpt} [ Confirmed Cases:  State , Exposure Source: Dairy Herds, Poultry Farms and Culling Operations, Other Animal Exposure, Unknown, State Total ] -- National , 41, 23, 2, 3, 69 {+1} 1) California , 36, 0, 0, 2, 38 2) Colorado , 1, 9, 0, 0, 10 3) Iowa , 0, 1, 0, 0, 1, 1 4) Louisiana , 0, 0, 1,0 , 1 5) Michigan , 2, 0, 0, 0, 2 6) Missouri , 0, 0, 0, 1, 1 7) Nevada , 1, 0, 0, 0, 1 8) Oregon , 0, 1, 0, 0, 1 9) Texas , 1, 0, 0, 0, 1 10) Washington , 0, 11, 0, 0, 11 11) Wisconsin , 0, 1, 0, 0, 1 12) Wyoming , 0, 0, 1, 0, 1 {+1}  [ Probable Cases:  State , Exposure Source: Dairy Herds, Poultry Farms and Culling Operations, Other Animal Exposure, Unknown,  State Total ] -- National , 1, 6, 0, 1, 8 - Arizona , 0, 2, 0, 0, 2 -- California , 1, 0, 0, 0, 1 -- Delaware , 0, 0, 0, 1, 1 -- Ohio , 0, 1, 0, 0, 1 -- Washington , 0, 3, 0, 0, 3 NOTE : One additional case was previously detected in a poultry worker in Colorado in 2022. ...

 Wyoming’s First Human Bird Flu Case Confirmed February 14, 2025 Wyoming’s First Human Bird Flu Case Confirmed Wyoming’s first case of H5N1 avian influenza in a human has been confirmed in a Platte County older adult, according to the Wyoming Department of Health (WDH).  The woman represents the third confirmed hospitalization related to H5N1 in the United States. “While this is a significant development as bird flu activity is monitored in Wyoming and across the country, it is not something we believe requires a high level of concern among most Wyoming residents,” said Dr. Alexia Harrist, state health officer and state epidemiologist with the Wyoming Department of Health. Harrist said the woman is hospitalized in another state , has health conditions that can make people more vulnerable to illness, and was likely exposed to the virus through direct contact with an infected poultry flock at her home .  H5N1 has been known to be infecting wild birds in Wyoming for some tim...