Indian authorities in the northern state of Punjab have quarantined around 40,000 residents from 20 villages following a Covid-19 outbreak linked to just one man.
The 70-year-old died of coronavirus – a fact found out only after his death.
The man, a preacher, had ignored advice to self quarantine after returning from a trip to Italy and Germany, officials told BBC Punjabi’s Arvind Chhabra.
India has 640 confirmed cases of the virus, of which 30 are in Punjab.
However, experts worry that the real number of positive cases could be far higher. India has one of the lowest testing rates in the world, although efforts are under way to ramp up capacity.
There are fears that an outbreak in the country of 1.3 billion people could result in a catastrophe.
The man, identified as Baldev Singh, had visited a large gathering to celebrate the Sikh festival of Hola Mohalla shortly before he died.