In Delhi, three people who had come from Singapore tested positive while two were those who contracted the virus from the flu patients. The rest of the cases were of those who had returned from abroad.

Of the four cases in Chennai, two members of a family - 37-year-old woman and an eight-year-old girl - were found to be infected with the virus Monday.

In Hyderabad, one of the cases is of a 30-year-old woman, who had contracted the virus from a person who had the flu earlier.

The lone case in Bangalore is of a 28-year-old man who also got it through a person detected positive with the virus.

In Patiala, a 23-year-old man, who had visited Bangkok, tested positive.