- Scientists modified the MMR vaccine to create a new trivalent MMS vaccine against Measles, Mumps and SARS-CoV-2, delivered via the nose. In animal models, experiments suggested the lifelong immunity to measles and mumps provided by MMR may translate into prolonged protection against COVID-19. https://www.pnas.org/doi/10.1073/pnas.2220403120 18 comments science