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Continue to ChatEffectiveness of mRNA boosters after homologous primary series with BNT162b2 or ChAdOx1 against symptomatic infection and severe COVID-19 in Brazil and Scotland: A test-negative design case–control study - https://okcheartandsoul.com/world/effectiveness-of-mrna-boosters-after-homologous-primary-series-with-bnt162b2-or-chadox1-against-symptomatic-infection-and-severe-covid-19-in-brazil-and-scotland-a-test-negative-design-case-co/