FILE - This electron microscope image provided by the National Institutes of Health shows human respiratory syncytial virus (RSV) virions, colorized blue, and anti-RSV F protein/gold antibodies, colorized yellow, shedding from the surface of human lung cells. Federal advisers on Wednesday, June 26, 2024, made a stronger endorsement for RSV vaccinations for people 75 and older, but made a narrower recommendation for people 60 to 74. (National Institute of Allergy and Infectious Diseases, NIH via AP, File)