Former president Nelson Mandela continues to respond to treatment as he marks two weeks of being in hospital, the Presidency said on Saturday afternoon.
Earlier in the day, President Jacob Zuma visited Mandela and "assured him of the love and support of all South Africans, young and old, and the whole world," said Presidential spokesperson Mac Maharaj in a statement.
"We urge South Africans to continue praying for our beloved Madiba during this period. Our hearts are with the whole family and relatives."
Mandela, who is 94 years old, was diagnosed with a lung infection and also underwent gallstone surgery.
He was originally flown to hospital in Pretoria from his Eastern Cape home at Qunu on 8 December.
According to Associated Press, on Thursday, President Zuma gave the first official acknowledgement that Mandela's condition had been grave.
"I've been informed that, at his age, doctors need to intervene in a very gradual and sensitive way in order to maximise the chances of a full recovery," Zuma said at the time.
"The medical team has our full confidence and he is receiving the best care possible."
Mandela has a history of lung problems having suffered from tuberculosis towards the end of the 27 years he spent in prison.
His current stay in hospital is his longest since he was freed over two decades ago.