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My mate’s sister is a nurse (England, South Coast) and apparently she said the cases she is dealing with now are much less severe than the initial wave. Is this true? Can a medical practitioner explain this? (I understand, vaguely, that the initial strain of a virus can be more deadly but then it weakens to become more transmissable as obviously killing its hosts doesn’t allow a virus to spread - but then I’ve also heard that viruses can mutate into more deadly strains too).