Moderna's coronavirus vaccine tested in humans shows early promise

First coronavirus vaccine to be tested in humans uses genetic material from a virus, called mRNA, to prompt the immune system to fight the disease

An experimental coronavirus vaccine made by the biotech company Moderna provoked a promising immune response against the virus and appeared safe in the first 45 people who received it, researchers reported on Tuesday in The New England Journal of Medicine.

Moderna’s vaccine, developed with researchers at the National Institute of Allergy and Infectious Diseases, was the first coronavirus vaccine to be tested in humans, and the company announced on Tuesday that large Phase 3 tests of it would begin on July 27, involving 30,000 people. Half of the participants will be a control group who will receive placebos.

The trial