The H1N1 virus continued to invade Kolkata and infect its citizens as never before, with the State Health Ministry reporting 12 new cases on Tuesday. With this, the toll has gone up to 72 in the past month. An alarmed State Government on Tuesday decided to open quarantine wards in various State hospitals, apart from setting up virus-detecting facilities at two more places other than the one already existing. Kolkata currently has two such centres