U.S. officials and Chinese authorities said that antiviral drug remdesivir, used as a treatment for Ebola, is being tested on new coronavirus patients in China. Gilead Sciences announced it would collaborate with U.S., Chinese, and other health officials to investigate whether the drug works. Dr. Anthony S. Fauci, the head of the U.S. National Institute of Allergy and Infectious Diseases, said in a news conference that remdesivir tests have “now begun in a randomized controlled trial in two separate trials in China by one of our colleagues,” Dr. Anthony Fauci, said. They’re looking at the “effectiveness of the drug” in...