Mumbai recorded 3,671 new coronavirus cases on Thursday, a 46.25 per cent increase over the previous day, civic officials said.
While the new daily spike was highest since May 5, no new fatalities were recorded in the financial capital of the country.
As per the Institute of Mathematical Sciences, Chennai, the R-value, which indicates how fast the virus is spreading, was 2.01 in Mumbai between December 23-28.
The tally of COVID-19 cases in the city rose to 7,79,479 on Thursday, while the death toll reached 16,375.
Mumbai had reported 1,377 new cases on Tuesday and 2,510 cases on Wednesday.
On May 5, 2021, during the second coronavirus wave, the city had logged 3,879 new cases.
According to the civic officials, Mumbai has reported zero fatalities for the seventh time in December. On December 25 too no fatalities on account of the pandemic had been reported.
But the cases have increased alarmingly in the last ten days. On December 20, only 283 infections had come to light.
The overall growth rate of cases rose to 0.15 per cent for the period between December 23 to 29, while the caseload doubling rate or the period taken for the caseload to double, dropped to 505 days.