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Indian researchers have found 19 coronavirus variants circulating in India with "escape mutations" that allow them to evade the antibodies generated by immune systems and one such variant is spreading fast in Andhra Pradesh.
Karnataka on Sunday reported 911 fresh coronavirus infections and 11 deaths taking the total cases and fatalities to 9,16,256 and 12,062 respectively.
Three more UK returnees were among those who tested positive, taking their total to 26, the state government said.
The total infections comprised 8,91,095 cumulative discharges of them 1,214 on Sunday and 13,080 active cases, including 209 in the intensive care units of various hospitals, a health department bulletin said.
West Bengal's Covid-19 tally mounted to 5,47,443 on Sunday as 1,435 more people tested positive for the infection, a health bulletin said.
Twenty-nine more people succumbed to the infection, pushing the state's coronavirus death toll to 9,598, it said.
As many as 1,740 more people have been cured of the disease, taking the recovery rate among the coronavirus patients in the state to 95.73 per cent, the bulletin said.
The Covid-19 tally in Maharashtra rose to 19,19,550 on Sunday with the addition of 3,314 fresh infections, the state health department said.
With 66 more people succumbing to the viral disease, the overall death toll in the state mounted to 49,255, it said in a statement.
A total of 2,124 patients were discharged in the state during the day, taking the number of recoveries to 18,09,948, it said.