Chennai, Aug 10 (ANI): A native of Tamil Nadu coming back from Guinea to Chennai has been kept under observation for Ebola virus, said a doctor on Sunday. The 26-year-old man from Theni district was taken to the Rajiv Gandhi Government General Hospital immediately after he landed from the West African country. His blood sample has been sent to Pune for test and the man has been kept in isolation ward till then. As per media reports, the corridor leading to the isolation ward, was cordoned off and the authorities at the hospital were instructed to wear masks.