Intended for healthcare professionals

Letters Vaccine interval policy

Optimal dosing interval for covid-19 vaccines: we need clinical trial evidence and to consider past infection

BMJ 2021; 372 doi: (Published 24 February 2021) Cite this as: BMJ 2021;372:n522
  1. Ulrich Müller-Sedgwick, consultant psychiatrist1 2
  1. 1Barnet, Enfield, and Haringey Mental Health NHS Trust, London N15 3TH, UK
  2. 2Department of Psychiatry, University of Cambridge, Cambridge, UK
  1. um207{at}

I agree with Chatterjee that “the decision to delay the second dose of the Pfizer vaccine against covid-19 has caused significant disquiet among healthcare workers in the UK.”12 I wonder why two obvious solutions have not been discussed in the medical literature and media.

Firstly, we don’t know which dosing interval of three (Pfizer BioNTech), six (World Health Organization), or …

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