The condition of Bhattacharjee's wife Mira, who was also taken to the same hospital, is also stable, authorities at the medical establishment said.

"Bhattacharjee is still in the CCU and on BiPAP and is maintaining oxygen level at 92 per cent. He is a bit drowsy but is responding to commands. His blood pressure is stable," the statement said.

The 77-year-old veteran politician, who had tested positive for COVID-19 on May 18, has a heart rate of 56 beats per minutes and his urine output is satisfactory, it said.

Bhattacharjee was given a loading dose of Remdesivir injection on Tuesday night and doctors are planning to give Tocilizumab injection if needed, it said.