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Innate immunity in young children being studied wrt response to COVID and how live attenuated polio vaccine lowered incidence of Covid-19 infection. Caveats and limitations aplenty leading to follow up questions to be answered in future studies.
Medical Mythbusting Commentary for March 22 and 23, 2022 Source:Study links the usage of oral polio vaccines with lower incidence of COVID-19Children’s antibody responses to COVID-19 are stronger than adults’, study finds Reference:Use of oral polio vaccine and the incidence of COVID-19 in the world