Both the Oxford and Pfizer jabs offer good protection against the Delta variant but those who do test positive can easily pass it on
The Pfizer vaccines was found to initially be more effective – but its efficacy declined over time
Oxford University scientists regularly PCR tested more than 700,000 random people, who were analysed from before and after May 17, 2021, when Delta became the UK’s dominant variant. Sarah Walker, professor of medical statistics and epidemiology at Oxford University, said: ‘We don’t yet know how much transmission can happen from people who get Covid-19 after being vaccinated – for example, they may have high levels of virus for shorter periods of time.
Dr Koen Pouwels, senior researcher at Oxford University’s Nuffield Department of Population Health, said that the team ‘can be confident’ that the numbers ‘really represent a decline’ for the Pfizer vaccine, whereas for Oxford/AstraZeneca ‘the differences are compatible with chance, that is there could be no change at all in the protection from AZ’.
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