About 21 swine flu cases were reported in Nagpur district of Maharashtra in the last three days, a civic health official said on Tuesday, according to the PTI. 
The number of cases of swine flu stood at just six from January 1 to June 30, he said.

"The patients with H1N1 flu symptoms started reporting from the second week of July. 28 persons were detected with swine flu from the second week of July till the month end," said the Nagpur Municipal Corporation (NMC) official, as per the PTI.