Conor Friedersdorf @conor64
RT @jbhenchman: They've existed for some time - Moderna completed its Phase 2 trial of a Delta booster in May 2021 - but the FDA has been d… — PolitiTweet.org
Matthew Yglesias @mattyglesias
With mRNA technology, weren't there supposed to be variant-optimized revisions to the vaccines? Whatever happened to that plan?