A total of 15 persons tested positive for COVID-19 in Tamil Nadu on Thursday. One person succumbed to the infection. A 58-year-old woman from Tiruchi, who had hypertension and disseminated malignancy with lung metastasis, was admitted to a private hospital on May 11 with fever, cough and difficulty in breathing. She tested positive for COVID-19 on May 15 and died on May 17 due to COVID-19 pneumonia. There were three fresh cases each in Chennai and Kanniyakumari and two in Chengalpattu. Coimbatore reported no case. A total of 78 persons were discharged and 189 persons are under treatment. A total of 5,180 samples were tested.