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<p>Public Health England is monitoring the effectiveness of the COVID-19 vaccines
and has published early evidence on both the Pfizer/BioNTech and University of Oxford/AstraZeneca
vaccines. This evidence suggests that a single dose of either vaccine is approximately
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.</p><p>As
the COVID-19 vaccination programme continues in younger age groups, vaccine effectiveness
estimates in these age groups will be published in due course. Vaccine effectiveness
will continue to be monitored long-term in order to understand the need for booster
doses.</p>
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