Pfizer, Moderna Chiefs Diverge on Need for Fourth Covid Shot

Top executives at two of the biggest Covid-19 vaccine manufacturers are split over how necessary a fourth dose is for most of the world’s population.

Pfizer Inc. Chief Executive Officer Albert Bourla said in a CBS interview on Sunday that protection from three shots will wane and a fourth dose is needed “right now”. Then, in an interview, Moderna Inc. President Stephen Hoge said a second booster is probably only necessary for older people or those who are immunocompromised, with the rest of the public able to be more selective about receiving the shot, Business Insider reported Monday.

Both men ...