Port Blair, March 4: During RAT conducted on 50 passengers bound for North & Middle Andaman at Ferrargunj, no positive case has been detected. At Mohanpura Bus Terminus, test was conducted on 30 passengers, no positive case has been detected.  At Phoenix Bay Jetty, 9 passengers were tested with RAT, no positive case has been detected. At Helipad, test was conducted on 9 passengers, no positive case has been detected