Public Health England is monitoring the effectiveness of the COVID-19 vaccines and has published early evidence on the efficacy of both the Pfizer/BioNTech and Oxford/Astrazeneca vaccines. The evidence suggests that a single dose of either vaccine is around 60 to 70% effective at preventing symptomatic disease in older adults and around 80% effective at preventing hospitalisations. There is also evidence that a single dose of the Pfizer/BioNTech vaccine is around 85% effective at preventing deaths. Further information is available at the following link:
Effectiveness of two doses with a 12-week gap will be monitored as more individuals start to receive their second dose.