Is the British approach of prioritising first doses of Covid vaccines and not promising a second dose until 12 weeks later compromising our ability to fight the disease? It is not a moot point, with several EU figures asserting that it is a risky route to take.
As I wrote here a couple of weeks ago, as far as the AstraZeneca/Oxford vaccine is concerned, what evidence we have supports the practice of delaying a second dose until 12 weeks after the first one; the vaccine is more effective that way.
However, a question mark has continued to hang over the Pfizer/BioNTech vaccine. There is limited data on the most effective dosing regime in this case because the phase 3 trials did not experiment with delayed doses – everyone involved was given a second dose 21 days after the first.
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