Moderna Quits CMV Vaccine After Phase 3 Failure
Moderna’s bid to bring the first vaccine for congenital cytomegalovirus (CMV) to market has ended in disappointment. The company says its investigational CMV vaccine, mRNA-1647, failed to meet the primary endpoint in a large Phase 3 trial, prompting the company to discontinue development for use in preventing congenital CMV. The vaccine showed efficacy ranging from just 6% to 23%, well below Moderna’s target for preventing primary CMV infection, it says. CMV, a common herpesvirus, is typically harmless in healthy adults but can cause severe birth defects when passed from a pregnant person to a fetus.
While Moderna is ending its congenital CMV program, the company says it will continue testing mRNA-1647 in a Phase 2 trial in bone marrow transplant patients, where CMV reactivation can cause serious illness.