Scientists race to find a cure or vaccine for the coronavirus. Here are the top drugs in development

Health officials and scientists across the world are racing to develop vaccines and discover effective treatments against the coronavirus, which has infected more than 4.2 million people worldwide in as little as four months, according to data compiled by Johns Hopkins University.

There are no proven, knockout treatments and U.S. health officials say a vaccine could take at least a year to 18 months.

On May 1, the Food and Drug Administration granted emergency use authorization for Gilead Sciences’ antiviral drug remdesivir. This after a government-run clinical trial found Covid-19 patients who took remdesivir usually recovered after 11 days. That is four days faster than those who didn’t take the drug. The EUA means doctors in the U.S. will be allowed to use remdesivir on patients hospitalized with Covid-19 even though it has not been formally approved by the agency.