The eastern state of Bihar added 2,426 unrecorded deaths while the southern state of Kerala added 263 deaths to their tallies on Sunday, a federal health ministry spokesperson told Reuters.
The revised figures took single-day deaths to 2,796, the highest since July 21, according to a Reuters tally.
A devastating second wave in March and April this year saw thousands of deaths and millions affected.
Indian states have continued to add unreported COVID-19 deaths in recent months, lending weight to some medical experts' opinions that such deaths are much higher than the reported number of 473,326.
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