Evidence of Covid-19 protection by "trained immunity" after MMR booster vaccination: https://medicalxpress.com/news/2020-10-vaccine-covid-deadly-mexico-city.ht

Evidence of Covid-19 protection by "trained immunity" after MMR booster vaccination: https://medicalxpress.com/news/2020-10-vaccine-covid-deadly-mexico-city.html https://medicalxpress.com/news/2020-10-vaccine-covid-deadly-... Evidence of Covid-19 protection retained from much earlier original MMR vaccination: https://news.ycombinator.com/item?id=23250680 https://news.ycombinator.com/item?id=23250680