It's still nearly a month after the first injection before full immunity.
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The Pfizer vaccine requires two doses to be fully effective.
According to Prof Sir Munir Pirmohamed, chairman of the Commission on Human Medicine Expert Working Group, the first jab provides only partial immunity, from about 12 days after the injection.
People will be given a second dose of the vaccine 21 days after the first, and they should be fully immune seven days after that.
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