Respiratory syncytial virus (RSV) already represents a blockbuster business with Sanofi reporting that Beyfortus (nirsevimab) hit global sales of €1.7 billion (roughly $1.77 billion) in its first full year on the market in 2024. Beyfortus protects infants from lung infections caused by RSV Beyfortus can help prevent a serious lung disease associated with RSV in…