19 January, the third day of India’s massive inoculation campaign for Covid-19, began on a confused note in the capital city of Delhi. At the privately-run Max Hospital in Saket, a suburb in South Delhi, two doctors received text messages informing them that their vaccinations had been delayed. Another doctor at the same hospital, who had already received the first dose of the vaccine, got an SMS urging him to turn up for a jab on 21 January.

That wasn’t the only part of the process that had seemingly hit a snag. CoWIN, the technology platform meant to help track Covid vaccinations, was glitching repeatedly.