Search for a COVID-19 vaccine heats up in China, US

Three potential COVID-19 vaccines are making fast progress in early-stage testing in volunteers in China and the U.S., but it’s still a long road to prove if they'll really work. China’s CanSino Biologics is beginning the second phase of testing its vaccine candidate, China's Ministry of Science and Technology said Tuesday. The first person to receive that experimental vaccine last month returned to a Seattle clinic Tuesday for a second dose.

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