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Boris Johnson has warned that people will need to be revaccinated in autumn.
Speaking during Prime Minister's Questions at the Commons, he said it would be necessary to revaccinate people as some strains of Covid-19 may prove resistant to current vaccines.
He said: "As the house will have heard from the chief medical officer and the deputy chief medical officer and others, I think we're going to have to get used to vaccinating and then re-vaccinating in the autumn as we come to face these new variants."
It comes after a small study indicated that the Oxford-AstraZeneca might not be as effective on the South African mutation of the virus.
Read more about Covid-19 vaccines here.
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