Researchers have begun the first study in the U.S. of an experimental drug aimed at treating the novel coronavirus, the National Institutes of Health said Tuesday.

Researchers at the University of Nebraska have started testing an experimental antiviral drug from Gilead Sciences Inc., the NIH said. The first U.S. study subject is an American who is among 13 passengers who were quarantined on the Diamond Princess cruise ship and transported recently to the University of Nebraska Medical Center on Feb. 17 for further isolation...