Kolkata, one of the most densely-populated cities in India, has been hit hard by country's second Covid-19 wave.
Stories of the surge have been distressing - people gasping to stay alive as they wait for critical care beds and treatment; desperate families scrambling for everything from oxygen cylinders to a doctor's appointment; mass funeral pyres and parking lots turning into crematoriums to accommodate the rising number of dead.
Controlling the spread of a highly transmissible virus such as Covid is much more difficult in a country as densely populated as India, and the effects have been devastating.

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