Why Covid-19 Vaccines Can’t Be Silver Bullet: Immunity Explained

Federal health officials are preparing to distribute, by the end of December, the first 40 million doses of Covid-19 vaccines from Moderna Inc. and Pfizer Inc./BioNTech SE, pending authorization from the Food and Drug Administration.

The 95% efficacy demonstrated by both vaccine candidates offers hope of ending the global spread of the novel respiratory disease.

But public health officials caution that the good news about vaccines doesn’t mean the shots will immediately stop the virus from spreading. It likely will take more than that to eradicate Covid-19. Here’s a reality check on what lies ahead:

1. Will I Still Have ...