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Pfizer-BioNTech mRNA vaccine reduces both symptomatic and asymptomatic COVID-19 infection in case study Follow-up of vaccinated and unvaccinated individuals at St. Jude Children’s Research Hospital, USA, revealed asymptomatic infection reduced by 90% and symptomatic infections reduced by up to 96% in vaccinated people compared to those not vaccinated. The Pfizer/BioNTech mRNA was approved for use in the USA in December 2020. Clinical trials reported an efficacy of 94.8%, and it has been shown to reduce symptomatic infection of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)...