Harmful Mercury In Flu Shots? Nope. Here's The Chemistry You Should Know

Health and Human Services Secretary Robert F. Kennedy, Jr. is once again warning about the supposed dangers posed by mercury-containing vaccines. "I’m proud to finally deliver on a long-overdue promise: protecting our most vulnerable from unnecessary mercury exposure," he tweeted in early August. Kennedy was celebrating the removal of the preservative thimerosal from a small fraction of seasonal flu vaccines. The problem? He bungled basic chemistry in his rush to (once again) badmouth immunization. Let's take a look.