Research suggests childhood vaccines (MMR, BCG, and polio) may provide cross-reactivity and some protection against covid-19. Most people under 50 have received the MMR and polio vaccines. Starting in the 1990’s, children received two MMR vaccinations rather than one, when two was reported to give greater protection. Cross-reactivity with childhood vaccines could explain lesser symptoms or the absence of symptoms in children and younger adults; could provide an opportunity for stop-gap measures to control covid-19; and could provide new opportunities for research against covid-19 and other viruses.
Vaccination history may be important information in covid-19 patients, particularly in children.
https://thehill.com/blogs/congress-blog/healthcare/499492-potential-cross-reactivity-between-mmr-vaccinations-and-covid
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