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flag Moderna halted its CMV vaccine development after a Phase 3 trial showed it didn’t prevent infection in women.

flag Moderna has discontinued development of its mRNA-1647 cytomegalovirus vaccine for preventing congenital CMV after a Phase 3 trial showed it failed to meet its primary goal of preventing infection in seronegative women aged 16 to 40, with efficacy ranging from 6% to 23%. flag The trial involved about 7,500 women across 13 countries. flag While the vaccine was well-tolerated with no new safety concerns, Moderna will continue a Phase 2 trial in bone marrow transplant patients. flag The outcome won’t affect its 2025 financial guidance or breakeven projection by 2028, and full data will be shared with the scientific community.

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