For the first time, a major study suggests that an experimental drug works against the new coronavirus, and U.S. government officials said Wednesday that they would work to make it available to appropriate patients as quickly as possible.

In a study of 1,063 patients sick enough to be hospitalized, Gilead Sciences's remdesivir shortened the time to recovery by 31% — 11 days on average versus 15 days for those just given usual care, officials said. The drug also might be reducing deaths, although that's not certain from the partial results revealed so far.

"What it has proven is that a drug can...