With a non-stop 24-hour operation, Assam has been able to trace nearly 500 people from the state who took part in the religious congregation in Delhi's Nizamuddin area last month that has emerged as the biggest coronavirus hotspot in India, Assam Health Minister Himanta Biswa Sarma said on Wednesday. At least 16 people of those traced to the event held at the Markaz or headquarters of the Islamic missionary group Tablighi Jamaat have tested for coronavirus, he said.