Thounaojam Bubhonchandra, additional director of state health department, said there was no cause for fear with the detection of one positive case of swine flu, and the health department has stepped up surveillance and taken necessary preventive measures against its spread in the state.

Authorities in the northeastern region had earlier stepped up precautionary measures against the spread of swine flu, besides banning import of pigs and pork products from adjoining countries.

The northeastern states share mostly unfenced borders with Myanmar, Bangladesh, Bhutan and China.

'We are on a maximum alert with our rapid action teams keeping a strict vigil along the international border with Myanmar and Bangladesh and also boundaries with other northeastern states,' said C. Sangnghina, director of Mizoram's animal husbandry and veterinary department.

'We are holding regular review meetings and collecting reports from deputy commissioners on the latest situation,' he added.

Sale of pork in Mizoram, Tripura, and Manipur has already come down after swine flu cases were reported in India. Pigs are normally imported from Myanmar and pork is a favoured delicacy of the Mizos and other tribals.