Efficacy data for Pfizer Inc.’s respiratory syncytial virus (RSV) vaccine proved convincing for members of the U.S. FDA’s Vaccines and Related Biological Products Advisory Committee, which voted 14-0 May 18 in favor of Abrysvo’s effectiveness when administered during the second or third trimester of pregnancy to protect infants from birth to 6 months, with the adcom endorsing safety data in a 10-4 vote.