Sir, – The two main explanations for the origin of the coronavirus causing Covid-19 are not mutually exclusive ("Covid-19 originated in Wuhan market, says new research", World, February 28th).
It is quite possible that the virus escaped from the Wuhan laboratory and entered the human population at the live food market. The fact quoted that two strains simultaneously occurred at the market favours this explanation. – Yours, etc,
Dr EVAN A BAYTON,
Warrington,
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UK.