A person in Colorado tested positive for avian influenza A(H5N1) virus (H5 bird flu), Colorado Department of Public Health and Environment reported April 28, 2022. Centers for Disease Control and Prevention (CDC) confirmed it is the first U.S. case of H5 bird flu. The person was involved in the culling of poultry with presumptive H5 bird flu. The person reported 1 symptom (fatigue) that resolved after 3 days. The person is in isolation on oseltamivir treatment.
Starting in January 2022, U.S. Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) found highly pathogenic avian influenza A(H5N1) virus in U.S. wild birds. The virus was later found in U.S. commercial poultry and backyard bird flocks.
Detection of H5 bird flu in 1 person involved in poultry culling does not change the health risk to the general public, which is low. People exposed to infected birds during work or recreation are at greater risk and should follow recommended precautions. For details, see CDC’s April 29, 2022 health advisory.
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