You might have heard a radio advertisement warning that if you've had Covid, you could get it again and experience even worse symptoms. The message, sponsored by the Health and Human Services Department, claims that updated bivalent vaccines will improve your protection.

This is deceptive advertising. But the public-health establishment's praise for the bivalent shots shouldn't come as a surprise. Federal agencies took the unprecedented step of ordering vaccine makers to produce them and recommending them without data supporting their safety or efficacy.