As many as 40 COVID-19 patients, who got a single-dose drug cocktail of monoclonal antibodies at Hyderabad's Asian Institute of Gastroenterology (AIG), recovered from clinical symptoms like fever, malaise etc in 24 hours, hospital chairperson Dr Nageshwar Reddy said. He said patients were analysed for a week, adding, "Almost in 100% (cases), the (COVID-19) virus disappeared when we did RT-PCR."