"His condition is stable. He is still on the ventilator but he is responding to the treatment," Dr Sampath Kumar, head of Cardiac Thoracic Vascular Sciences Department of AIIMS, said.

Scotching rumours about the health of the 84-year-old former Prime Minister, Kumar said "his condition has not deteriorated. He has no fever". He is making progress".

Kumar said functioning of his liver and kidney and his blood pressure are normal.

Asked about the former Prime Minister's respiratory track infection, Kumar said doctors have given him antibiotics and they would take two to three days to have their full effect.

"We will have to wait for a few more days for his full recovery," he said.

Vajpayee was admitted to AIIMS on Tuesday with complaints of fever and chest congestion. Doctors later found that he was suffering from pneumonia.

UPA Chairperson Sonia Gandhi and External Affairs Minister Pranab Mukherjee had separately visited AIIMS on Saturday to enquire about the health of the BJP veteran.