Pfizer Inc.’s bivalent prefusion vaccine for protecting newborns from severe respiratory syncytial virus (RSV) hit one of its two primary endpoints in its phase III study, which was good enough for the company to stop enrollment and plan to submit a BLA to the U.S. FDA by year-end. PF-06928316 is one of six RSV vaccines in active phase III development globally, which includes an Astrazeneca plc-Sanofi SA collaboration plus one from GSK plc. Pfizer’s is the only one developed for infants by way of maternal immunization and for older adults.