A paramedic wearing a protective face mask and gloves is seen at the back of an ambulance outside St Thomas' hospital, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 1, 2020. REUTERS/Hannah McKay
The original virus and strains such as Alpha and Delta caused waves of infections, hospital admissions and deaths around the world. Reuters

Original coronavirus strain 'no longer found in humans' after Omicron takeover

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