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. Earlier in the week I wrote here about the Scottish population-wide study which found that a single dose of the Pfizer vaccine reduced hospital admissions by 85 per cent between 28 and 34 days after the jab.
This morning comes Imperial College’s React-2 study, which paints a picture that is, on the face of it, rather less flattering. It tested 154,000 people for the presence of antibodies to SARS-CoV-2, the virus which causes Covid-19. Of these, 18,000 had had at least one dose of a Covid vaccine.
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