https://apnews.com/a7d254f0299d846062bf6195031880a3

The first one-shot COVID-19 vaccine provides good protection against the illness, Johnson & Johnson reported in a key study released Friday, offering the world a potentially important new tool as it races to stay ahead of the rapidly mutating virus.

The pharmaceutical giant's preliminary findings suggest the single-dose option may not be as strong as Pfizer's or Moderna's two-dose formula, and was markedly weaker against a worrisome mutated version of the virus in South Africa.