How an old tuberculosis vaccine might help fight the new coronavirus
Here is what scientists know, and what they are trying to find out.
A vial of the measles, mumps, and rubella virus (MMR) vaccine is pictured at the International Community Health Services clinic in Seattle, Washington, U.S., March 20, 2019. Picture taken March 20, 2019(photo credit: REUTERS/LINDSEY WASSON)ByREUTERS
