On May 31, 2024, Moderna, Inc. announced the FDA approval of mResvia® (mRNA-1345) for protection against lower respiratory tract infection caused by respiratory syncytial virus (RSV) in adults 60 years and older. RSV is a highly contagious respiratory virus that typically causes mild, cold-like symptoms. However, it can cause pneumonia and lead to hospitalization in vulnerable populations such as infants and older adults. It is estimated that 6,000-10,000 older adults die each year in the U.S. due to RSV infection.
mResvia® is the third vaccine to be approved for the prevention of RSV. It is the second type of vaccine to employ messenger RNA (mRNA) technology, following the use of mRNA in vaccines against the COVID-19 virus. The two previously approved RSV vaccines, Abrysvo® and Arexvy, use recombinant DNA technology. The safety and efficacy of mResvia® was established in a large clinical trial of adults 60 years and older. The participants received a single injection of either mResvia® or placebo. mResvia® was found to be 83.7% effective in preventing lower respiratory virus infection caused by RSV. Common adverse reactions included injection site pain, fatigue, headache, muscle pain and joint pain. FDA granted mResvia® a breakthrough therapy designation. This new vaccine is expected to be available prior to the 2024-2025 RSV season.