Fauci Curious to See Secret of Covid Shot’s Success Unlocked

Forthcoming data on Johnson & Johnson and AstraZeneca Plc’s Covid-19 vaccine candidates will shed light on the one question still unanswered by the Pfizer and Moderna vaccine frontrunners—what gives the shot its fighting power.

Pfizer Inc.-BioNTech SE and Moderna Inc.'s vaccines will be the first to use the messenger RNA platform outside of a clinical trial, and the 95% success rate far exceeded expectations—which bodes well for other diseases like cancer. Moderna’s vaccine should be recommended for use by a Food and Drug Administration advisory panel Dec. 17 with an emergency use authorization quickly following, top infectious disease expert ...