A study by Public Health England finds that the Pfizer/BioNTech vaccine is 72% effective at preventing ALL coronavirus infection (including asymptomatic) 21 days after first dose, and 86% effective 7 days after second dose.
Effectiveness of BNT162b2 mRNA Vaccine Against Infection and COVID-19 Vaccine Coverage in Healthcare Workers in England, Multicentre Prospective Cohort Study (the SIREN Study) by Victoria Jane Hall, Sarah Foulkes, Ayoub Saei, Nick Andrews, Blanche Oguti, Andre Charlett, Edgar Wellington, Julia Stowe, Natalie Gillson, Ana Atti, Jasmin Islam, Ioannis Karagiannis, Katie Munro, Jameel Khawam, The SIREN Study Group, Meera A. Chand, Colin Brown, Mary E. Ramsay, Jamie Lopez Bernal, Susan Hopkins :: SSRN
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/963532/COVID-19_vaccine_effectiveness_surveillance_report_Febru ary_2021_FINAL.pdf
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