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Final tests of some COVID-19 vaccines to start next month


COVID-19 testing for the coronavirus.

(AP) -- A U.S. company says it's on track to begin a huge study next month to prove if its COVID-19 vaccine candidate really works.

The news comes at the same time that Brazil will help with final testing of a different shot from China.

Shots made by Moderna Inc. and the National Institutes of Health and by China's Sinovac work in different ways.

Moderna plans a study of 30,000 U.S. volunteers while researchers in Sao Paulo, Brazil, will recruit 9,000 people to receive Sinovac shots.

About a dozen candidates are in early stages of human testing in the global race for a vaccine.