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COVID: did a delayed second dose give the delta variant an evolutionary helping hand?

By Jonathan R Goodman, PhD Candidate, Human Evolutionary Studies, University of Cambridge
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The delta coronavirus variant, which was first detected in India, is now the dominant variant in the UK. Some experts warn that the delta variant may be 100% more transmissible than the previously dominant variant, alpha. But we don’t think that transmissibility alone explains delta’s dominance.

Successful variants often have a biological advantage – through mutation – that helps…

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