Early reports that patients infected by the Omicron variant of Covid-19 had mild symptoms raised hopes that the virus will become less virulent in future.That seems to fit with a commonly held belief that pathogens will cause fewer deaths or serious illnesses over time as they evolve to do less harm to the host to ensure they can continue to replicate.But scientists have warned that even if Omicron has evolved to spread more quickly than the Delta variant – which was itself highly transmissible…

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