By Even if highly contagious Covid-19 variant maximizes its potential, laws of biochemistry show the virus cannot keep improving indefinitely It is controversial whether viruses are alive, but – like all living things – they do evolve. This fact has become abundantly clear during the pandemic, as new variants of concern have emerged every few months. Some of these variants have been better at spreading from person to person, eventually becoming dominant as they out-compete slower versions of SARS-CoV-2, the virus that causes Covid-19. This improved spreading ability has been ascribed to mutations in the spike protein – the mushroom-shaped projections…
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