Sanofi SA and Astrazeneca plc had a lot to celebrate July 17 when the FDA approved Beyfortus (nirsevimab) ahead of schedule, making it the first respiratory syncytial virus (RSV) prophylactic for infants in the U.S. “This is just really an historic day,” Michael Greenberg, a Sanofi vice president and medical head of the company’s North America vaccines unit, told BioWorld. The companies had been expecting the FDA decision later this quarter. The earlier approval suggests the FDA appreciated the urgency of having time for health systems and doctors to get the drug ahead of the next RSV season, Greenberg said.