As many as 75 more people testedpositive for coronavirus in Tamil Nadu on Thursday and the total count rose to 309, a senior official said and the tally is the second highest in the country.Of the 75 cases reported today, 74 were returnees from a recent Tablighi Jamat congregation held in Delhi's Nizamuddin West and another was a contact of a person infected earlier, Health Secretary Beela Rajesh told reporters here.A total of 264 persons who had attended the conference from the State in the national capital have tested positive for the contagion, she said.