India now accounts for one in every six daily infections worldwide. Monday's new cases carried it past Brazil, for an overall tally of 13.53 million, data compiled by Reuters shows, placing it second after the United States, with 31.2 million.
A full opening of India's economy after last year's crippling lockdown, mass religious festivals and political rallies in states holding elections have worsened a second wave of infections, experts say.
In the northern city of Haridwar, nearly a million devotees thronged the banks of the Ganges, a river many Hindus consider holy, to join in the months-long 'Kumbh Mela' or pitcher festival, risking a surge in infections.
Few wore masks as they jostled for a dip in the waters on a day considered auspicious in the Hindu calendar.
Authorities have made virus tests mandatory for those entering the area, where officials said they were battling to hold back crowds.
Elections are also due in four big states this month, with Prime Minister Narendra Modi set to travel to the eastern state of West Bengal to address rallies that will draw thousands.
A death toll of 904 overnight was the highest since Oct. 18, taking the total figure to 170,179, data showed.