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World

Why do old people have fewer antibodies after the vaccine?

26 February 2021

1:02 AM

26 February 2021

1:02 AM

The UK policy of delaying second doses of the Pfizer vaccine has been criticised by some as risky, with Pfizer warning that there is no data on the effectiveness of its vaccine other than for the dosing regime used in phase 3 trials: two doses, 21 days apart. But evidence is steadily trickling through.

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