Moderna, Pfizer Coronavirus Vaccines Begin Final-Stage Testing

Two of the most advanced experimental coronavirus vaccines entered the pivotal phase of their studies on Monday, with the first subjects receiving doses of vaccines developed by Moderna Inc. and Pfizer Inc. Researchers evaluating the vaccines plan to enroll 30,000 people in separate last-stage, or phase 3 trials, results of which will determine whether the vaccines protect against symptomatic Covid-19, and whether they should be cleared for widespread use. (WSJ)

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