London — Treating critically ill Covid-19 patients with corticosteroid drugs reduces the risk of death by 20%, an analysis of seven international trials found on Wednesday, prompting the World Health Organisation (WHO) to update its advice on treatment.

The analysis — which pooled data from separate trials of low dose hydrocortisone, dexamethasone and methylprednisolone — found that steroids improve survival rates of Covid-19 patients sick enough to be in intensive care in hospital...

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