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FILE - This 2005 electron microscope image shows an avian influenza A H5N1 virion. (Cynthia Goldsmith, Jackie Katz/CDC via AP, File)

FILE - This 2005 electron microscope image shows an avian influenza A H5N1 virion. (Cynthia Goldsmith, Jackie Katz/CDC via AP, File)

This colorized electron microscope image released by the National Institute of Allergy and Infectious Diseases on March 26, 2024, shows avian influenza A H5N1 virus particles (yellow), grown in Madin-Darby Canine Kidney (MDCK) epithelial cells (blue). (CDC/NIAID via AP)

This colorized electron microscope image released by the National Institute of Allergy and Infectious Diseases on March 26, 2024, shows avian influenza A H5N1 virus particles (yellow), grown in Madin-Darby Canine Kidney (MDCK) epithelial cells (blue). (CDC/NIAID via AP)