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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

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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