KOLKATA, Feb 12- The state government today decided to lift from tomorrow the ban on trading and transportation of chicken and eggs imposed on 5 February, except in the 48 blocks and five municipalities where the avian flu had broken out. Poultry products would be allowed in and out of Murshidabad and Birbhum - the first to have been hit by the flu - only from authorised farms, though the ban would continue to be in force in 22 affected blocks in the two districts.