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Antibody levels generated by two doses of the Oxford/AstraZeneca or Pfizer/BioNTech coronavirus vaccine may start to fall six weeks after the second jab, and for some could drop by up to 50% in less than three months, research suggests.
Antibody levels generated by two doses of the Oxford/AstraZeneca or Pfizer/BioNTech coronavirus vaccine may start to fall six weeks after the second jab, and for some could drop by up to 50% in less than three months, research suggests.