On Saturday, India's health ministry said it had recorded 18,552 new coronavirus cases in the previous 24 hours -- its biggest daily jump so far.
The figure tipped the national total past half a million, with India now reporting 508,953 confirmed cases to date.
More than 295,000 of those cases have recovered, according to the health ministry.
The health ministry also recorded 384 new deaths in the past day, raising the toll to 15,685.
The fresh infections came as the Delhi government announced that serological surveys will be conducted across the city. The surveys will help officials understand the spread of infection and develop a "comprehensive strategy," the government said.