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In this photograph taken on July 15, 2020 doctors and nurses wearing Personal Protective Equipment (PPE) suits look after a COVID-19 coronavirus patient at the Intensive Care Unit of the Sharda Hospital, in Greater Noida. - Coronavirus cases in India passed one million on July 17, official data showed as authorities struggle to check the spread of the deadly pandemic across the world's second-most populous nation. (Photo by XAVIER GALIANA / AFP)
In this photograph taken on July 15, 202... […]

Contagious and concerning: What we know about Covid-19 variants

Fast-spreading coronavirus variants have ignited global concern over whether existing vaccines will be able to protect the world from a virus that is constantly mutating