The FDA is reconsidering certain mRNA vaccines, including a flu vaccine from Moderna that may face a higher bar for older adults. There are also reports of recruitment struggles with a US COVID vaccine study by Pfizer and BioNTech, as well as speculation about the potential reauthorization of a Pfizer COVID vaccine for young children. The future of mRNA technology, which is being explored for uses beyond infectious diseases, may be impacted by regulatory decisions and research developments.