What is evidence for delaying the 2nd dose of COVID-19 ?

The UK has made a pragmatic decision based on limited available evidence to delay the second dose so that more people can get the vaccine.

While there is some evidence for the Oxford vaccine, there is scant public evidence in support of delaying the Pfizer vaccine.

A BMJ news article provides an excellent summary of the current evidence.

Only time will whether there are any major risks to this approach.

Reference: Covid-19 vaccination: What’s the evidence for extending the dosing interval? BMJ 2021; 372 doi: https://doi.org/10.1136/bmj.n18 (Published 06 January 2021). Cite this as: BMJ 2021;372:n18

Covid-19: Order to reschedule and delay second vaccine dose is “totally unfair,” says BMA
BMJ 2020; 371 doi: https://doi.org/10.1136/bmj.m4978 (Published 31 December 2020)
Cite this as: BMJ 2020;371:m4978

NHS. Letter to chief executives of all NHS trusts and foundation trusts. 30 Dec 2020. https://www.england.nhs.uk/coronavirus/wp-content/uploads/sites/52/2020/12/C0994-System-letter-COVID-19-vaccination-deployment-planning-30-December-2020.pdf.

NHS. Coronavirus (COVID-19) vaccine. When the 2nd dose will be given.

Daily Mail. Pfizer warns there is NO proof its Covid jab works when doses are taken 12 weeks apart as UK regulator scraps 21-day rule in desperate attempt to get millions more vaccinated. By Connor Boyd Assistant Health Editor For Mailonline
14:52, 30 Dec 2020 , updated 16:58, 30 Dec 2020

Statement from the UK Chief Medical Officers on the prioritisation of first doses of COVID-19 vaccines. Joint clinical advice from the 4 UK Chief Medical Officers on the prioritisation of first doses of the coronavirus (COVID-19) vaccines. Published 30 December 2020.

Priority groups for coronavirus (COVID-19) vaccination: advice from the JCVI, 30 December 2020. Advice from the Joint Committee on Vaccination and Immunisation (JCVI) on the groups that should be prioritised for vaccination.

Disclaimer: Please note- This blog is NOT medical advice. This blog is purely for information only and do check the the sources where cited. Please DO consult your own doctor to discuss concerns and options relevant to you.

The views expressed in this blog represent the author’s views held at the time of drafting the blog and may change overtime, particularly when new evidence comes to light. The blog is not necessarily endorsed by any organisation the author is associated with and the authors views are not in way intended to be a substitute for professional advice.