Port Blair, May 31: During the RT-PCR test conducted on 247 incoming flight passengers who arrived here yesterday, no positive case has been detected.       During RAT conducted on 76 passengers bound for North & Middle Andaman at Ferrargunj, no positive case has been detected. At Phoenix Bay Jetty, 36 passengers were tested with RAT and no positive case has been detected. RAT was conducted on 38 passengers at Mohanpura Bus Terminus and no positive case has been detected. At Helipad, 1 passenger was tested with RAT and the report was negative.