Welcome to another installment of This Week at FDA, your weekly source for updates—big and small—on FDA, drug, and medical device regulation and what we're reading from around the web. This week, top FDA officials announced that the agency would require only a single pivotal trial for most drugs, the agency reversed course and said it would review Moderna's mRNA influenza vaccine, and FDA Commissioner Marty Makary said that most drugs should be available over-the-counter (OTC).