Intended for healthcare professionals

Letters Covax allocation of covid vaccines

Equity and evidence during vaccine rollout: stepped wedge cluster randomised trials could help

BMJ 2021; 372 doi: (Published 12 February 2021) Cite this as: BMJ 2021;372:n435
  1. Katy J L Bell, associate professor of clinical epidemiology1,
  2. Paul Glasziou, director2,
  3. Fiona Stanaway, senior lecturer in clinical epidemiology1,
  4. Patrick Bossuyt, professor of clinical epidemiology3,
  5. Les Irwig, emeritus professor of epidemiology1
  1. 1Edward Ford Building (A27), School of Public Health, University of Sydney, NSW 2006, Australia
  2. 2Institute for Evidence-Based Healthcare, Faculty of Health Sciences and Medicine, Bond University, Robina, QLD 4226, Australia
  3. 3Department of Epidemiology and Data Science, Amsterdam Public Health, Amsterdam University Medical Centers, Amsterdam, Netherlands
  1. katy.bell{at}

Herzog and colleagues raise the thorny issue of allocating scarce vaccines, comparing the proportional allocation model with a fair priority model.1 Regardless of what is used for prioritisation between and within countries, there will be a long period of rollout before most of the world’s population are offered vaccination. For groups of equivalent priority, a fair and equitable way to decide on the order of rollout is to use a lottery, or system of random choice.2 Such randomised …

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