People stand in a queue with their oxygen cylinders outside a shop to get them refilled amid the rising number of Covid-19 cases in New Delhi on April 28, 2021. | Mayank Makhija/NurPhoto via Getty Images Countries can’t go it alone in tackling Covid-19. During India’s first wave last fall, Dr. Harjit Singh Bhatti said he’d see one or two, maybe three extremely sick patients in his New Delhi hospital’s Covid-19 ward on any given day.