Merck & Co eyes growing RSV market with strong clesrovimab data

21 October 2024

Merck & Co (NYSE: MRK) has announced encouraging data from a Phase IIb/III clinical trial for clesrovimab, its investigational antibody designed to prevent respiratory syncytial virus (RSV) in infants.

The data, revealed at IDWeek 2024 in Los Angeles, positions clesrovimab as a potential rival to the RSV market leader, Sanofi (Euronext: SAN) and AstraZeneca's (LSE: AZN) Beyfortus (nirsevimab).

The trial tests a single dose of clesrovimab, administered to healthy preterm and full-term infants. The study met all primary endpoints, with RSV-associated lower respiratory infections reduced by 60.4% compared to placebo and RSV-related hospitalizations cut by 84.2%.

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