Patients and doctors alike are parsing signs of illness to figure out who needs what tests or care and how worried they should be.
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The new coronavirus can live in the air for several hours and on some surfaces for as long as two to three days, tests by U.S. government and other scientists show.
Those 18 and under have made up just 2.4 percent of cases of COVID-19 worldwide, according to a report released in late February by the World Health Organization.