Could common vaccine given to kids help prevent COVID-19 in adults?

The School of Medicine is the clinical coordinating center for an international trial aimed at evaluating on a large scale whether the MMR vaccine can protect front-line health-care workers against COVID-19. 

According to a front-page story in the St. Louis Post-Dispatch, the vaccine would not be used to treat illness; rather the researchers want to learn if a booster shot can provide broad immune protection to slow the spread of coronavirus and protect health-care workers who work in high-risk settings from developing COVID-19.