"13 persons including a two-year-old baby from the city tested positive for swine flu while the rest six were from the suburbs," West Bengal Principal Secretary (Health and Family Welfare) Moloy Dey said.
Out of 19, nine patients admitted in state-run hospitals were in "critical condition".
There was no report of any death due to swine flu in the last 24 hours, he said, adding, ten patients were released from different hospitals after their complete recovery.
Since January, 17 persons in the state have succumbed to swine flu.