Merck said on Friday it had stopped the phase 3 clinical trial early after an interim analysis showed that 7.3 per cent of patients on the drug had died or been hospitalised, versus 14.1 per cent of those receiving a placebo. Photograph: Handout/Merck & Co Inc/AFP via Getty

Merck said it would ask US regulators to authorise the first antiviral pill to treat Covid-19 after a late-stage clinical trial showed the drug cut th(...)

There are potential hazards. A radiologist who misreads a scan may harm one patient, but a flawed AI system in widespread use could injure many. Photograph: Getty

Computers were as good or better than doctors at detecting tiny lung cancers on CT scans, a study by researchers from Google and several medical centr(...)