Government think-tank Niti Aayog's office was sealed on Tuesday in New Delhi after one employee tested positive for coronavirus disease. “Niti Aayog is following all protocols as per the ministry of health guidelines. The building has been sealed…sanitisation of the building is underway,” a senior Niti Aayog official said. Contacts of the person, who got his report around 9am on Tuesday morning, have been asked to go on self-quarantine, the official said, adding that the office will be sealed for two-three days as per “prescribed protocol”.