Seven UK returnees test positive Updated: Updated: Samples sent to CCMB to check UK strain of coronavirus Share Article Samples sent to CCMB to check UK strain of coronavirus Seven out of 1,200 persons who have flown in to Hyderabad either directly or via UK since December 9 have tested positive for coronavirus. The samples of the seven positive cases are being sent to the Centre for Cellular and Molecular Biology (CCMB) in Hyderabad to check whether the affected persons had the mutated UK strain, a review meeting presided by Health Minister Eatala Rajender with senior officials of the department and an expert COVID-19 team was informed on Thursday evening.