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May 07, 2026
Merck's Enflonsia (clesrovimab) receives EU approval for RSV prevention in infants. Separately, researchers identify a monoclonal antibody cocktail from pediatricians' immune cells that shows potent protection against RSV and hMPV in animal studies.
Apr 17, 2026
The European Commission approved Enflonsia for prevention of RSV lower respiratory tract disease in infants during their first RSV season. Merck also reported new Phase 3 SMART data showing generally consistent second-season safety in high-risk children under 2 years old.
Feb 20, 2026
Phase III SMART trial data show clesrovimab maintained consistent safety and efficacy in high-risk children across two RSV seasons, with no drug-related serious adverse events reported in either season.
Feb 24, 2026
Merck announced positive second RSV season findings from the Phase 3 SMART trial evaluating ENFLONSIA (clesrovimab) in infants and children under 2 years at increased risk for severe RSV disease, showing consistent safety and antibody levels similar to healthy infants.
Feb 13, 2026
Merck stock reached a 52-week high at $122.69, rising 46.25% over 12 months and 7.4% in the past month following strong Q4 results and improved long-term pipeline outlook beyond Keytruda's 2028 patent expiration.
