Corrections
Correction
BMJ 2020; 369 doi: https://doi.org/10.1136/bmj.m1398 (Published 07 April 2020) Cite this as: BMJ 2020;369:m1398
This article https://www.bmj.com/content/368/bmj.m800 (BMJ 2020;368: m800 doi:10.1136/bmj.m800) was updated on 3 April 2020 to reflect changes to the advice given by NHS England and Public Health England.