It's starting to look more likely that the Rubella component of the MMR vaccine has a very high correlation to low severity in COVID cases. The other components may help as well. This hypothesis, made by two individuals, has been discussed here before but now has preliminary verification by heavy-hitter research organizations.
Hasn't hit big mainstream media yet, but these sources appear reputable:
https://www.globenewswire.com/news-r...anization.html
https://kdwn.com/2020/04/24/mmr-vacc...-for-covid-19/
https://www.medrxiv.org/content/10.1....10.20053207v1
And in 2014 researchers concluded that the measles vaccine protected against SARS (aka COVID-01).
https://www.sciencedirect.com/scienc...42682214000051
Verification of this, and ramping up production can be accomplished more quickly than certifying a new vaccine... and much of the population is already vaccinated anyway.
If this pans out, it will become the definitive case study of "Better to be Lucky than Good".