It is clear we are now dealing with a virus that spreads far more easily - probably more than twice as easily - as the version that emerged in Wuhan at the end of 2019.

The Alpha variant, first identified in Kent, UK, performed a large jump in its ability to transmit. Now Delta, seen first in India, leapt further still.

This is evolution in action.

So are we doomed to a never-ending parade of new and improved variants that get harder and harder to contain? Or is there a limit to how much worse coronavirus can become?

https://www.bbc.com/news/health-57431420

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