CHENNAI: A 21-year old student, who came to Chennai from Dublin in Ireland , has tested positive for Covid-19. He is the third patient to be tested positive for Covid-19 in Tamil Nadu The patient is admitted to Rajiv Gandhi Government General Hospital and his condition was stable, said state health minster C Vijaya Baskar on Thursday.The patient landed in Chennai on March 17. He was screened at the airport and sent on home quarantine as he did not show symptoms.On March 18, he came to hospital with symptoms of cough, fever and shortness of breath. Tests turned positive on Thursday, the minister said.The hospital is treating another Covid-19 patient, a 20-year old hair dresser from Delhi.Tamil Nadu’s first Covid-19 patient tested negative after treatment in Rajiv Gandhi Government General Hospital. The patient was discharged from hospital earlier this week.