West Bengal registered more than 2,000 cases after nearly six months as the state reported 2,128 new infections.
It was nearly double the cases reported on Wednesday when 1,089 infections were detected, and more than four times that reported on last Thursday -- 516.
The state's positivity rate jumped to 5.47%, from 2.84% on Wednesday.
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Kolkata's tally of new Covid-19 infections also more than doubled in 24 hours as the metropolis reported 1,090 cases on Thursday, as per the state Health Department. The city reported 540 new cases on Wednesday.