Pre-existing immunity?

Covid-19: Do many people have pre-existing immunity?

BMJ 2020; 370 doi: https://doi.org/10.1136/bmj.m3563 (Published 17 September 2020) Cite this as: BMJ 2020;370:m3563

We thank the BMJ for their generous use permissions during this time: “This article is made freely available for use in accordance with BMJ’s website terms and conditions for the duration of the covid-19 pandemic or until otherwise determined by BMJ. You may use, download and print the article for any lawful, non-commercial purpose (including text and data mining) provided that all copyright notices and trade marks are retained.”

Please see this article at the BMJ for Related Content and Rapid Responses.

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