AstraZeneca’s U.S. trial shows coronavirus vaccine is 79 percent effective

Oxford University and AstraZeneca reported on Monday that their coronavirus "vaccine for the world" was safe and 79 percent effective overall, according to data from a long-awaited clinical trial in the United States, alongside other studies in Chile and Peru. The two-shot regimen was completely effective at preventing severe cases of illness.

In a news release, the Oxford researchers, who developed the easily transported $4 shot for the British-Swedish pharmaceutical giant AstraZeneca, said their coronavirus vaccine is “safe and highly effective, adding to previous trial data from the United Kingdom,...