Swine flu has hit Kolkata yet again, this time probably in a mutated form. Twelve patients have tested positive for the H1N1 virus in the last 11 days, including minister Nandagopal Bhattacharya. Three tested positive on Thursday itself.

A 25-year-old man, Manoj Kriplani, has also tested positive. A patient of chronic renal failure, he returned to the city from Vellore recently. His condition is reported to be critical. Three patients are being treated at Beliaghata ID Hospital. More samples are being sent to the H1N1 testing laboratory attached with the National Institute of Cholera and Enteric Diseases, Beliaghata.