"We are helpless... never seen such a situation before... people are panicking..." - the desperate words of an overworked and traumatised Mumbai doctor driven to tears as an avalanche of Covid-positive patients threatens to overrun the medical infrastructure in one of the world's biggest cities. An appeal by Dr Trupti Gilada, an infectious diseases specialist, was widely shared on Tuesday - as the scale of the crisis - the lack of hospital beds, ever-increasing daily new cases, shortage of vaccines and crucial drugs like Remdesivir, and the oxygen crisis - becomes clear.