"Both the previous and the combination vaccines boost protection very well, although the combination vaccines produce slightly higher levels of antibody against some strains of Omicron. For a very small number of people another vaccine product may be advised by your doctor. You may be offered an updated combination version of these booster vaccines – the combination vaccines include a half-dose of the previous vaccine combined with a half-dose of a vaccine against the Omicron variant. The UK Health Security Agency says: "You will be given a booster dose of a vaccine made by Pfizer or Moderna. Read more : Covid booster bookings open for over 50s These will be offered to some, while others will get the previous vaccines used in earlier booster jab rounds. The UK has approved 'bivalent' or 'dual' vaccines from both Moderna and Pfizer, which are half a dose of the vaccines previously used mixed with half a dose of a vaccine that targets Omicron strains. The type of Moderna of Pfizer vaccine may be different too. This time, the AstraZeneca (Oxford) vaccine is not being used, only vaccines by Moderna (Spikevax) and Pfizer are offered, or Norovax to a small number who can not have either of those jabs. If you are getting a winter booster you may be offered a different jab to the variety you have had before. Everybody aged over 50 is invited for a winter booster jab along with frontline health workers and younger people who are at risk due to health conditions.
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