After a second dose, protection increases further, although at the moment there’s more evidence on second doses of Pfizer-BioNTech than Oxford-AstraZeneca. ![]() A round-up of evidence from around the world, by Public Health England, finds that one dose of the Pfizer-BioNTech or Oxford-AstraZeneca vaccines is fairly good at preventing infection and illness, and better at preventing hospitalisation or death. The benefits of the second dose start to appear after about 1 to 2 weeks.Īnd there are different degrees of protection: against death, against needing to go to hospital, against getting ill, and against getting infected at all. So you will need a second booster dose to make sure your immune system can consolidate this protection for the long term. But after a longer time – we aren’t yet sure how long – this protection is likely to start to fade again. It seems that some protection starts to appear about 2 weeks after the first dose, and then this increases over time. Your body needs to spend time responding to the vaccination before it can produce an effective immune response. ![]() ![]() If you had your first Covid-19 vaccine dose yesterday, then you are not protected yet.
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