RSV Vaccine

This electron microscope image 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.

WASHINGTON— A first-of-its-kind RSV vaccine for pregnant women guards their newborns against the scary respiratory virus — and federal health advisers recently backed Pfizer’s shot despite some lingering questions.