The experimental vaccine, developed by the National Institutes of Health and Moderna Inc., will start its most important step around July 27
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The drug did not seem to cause serious harm, though — about 40% on it had side effects, mostly mild stomach problems.
Facebook and Google, which owns YouTube, have already put similar systems in place.
Mathematical models aim to chart the path of the new coronavirus in the U.S. and Nevada, but the outcomes can vary wildly depending on basic assumptions about the disease.