Researchers are attempting to determine if immunity to the above viruses may alter a patients response to the COVID-19 virus. Vaccination may not be enough; scientists want to know if recent immunization or booster adds to the potential inhibition of the inflammatory response produced by the Corona virus.
https://www.google.com/amp/s/www.medicalnewstoday.com/amp/articles/mmr-vaccine-could-prevent-worst-symptoms-of-covid-19