Former South African President Nelson Mandela is showing great resilience, although he remains in a critical but stable condition, the presidency says.
The 95-year-old anti-apartheid hero has been in hospital since early June with a recurring lung infection.
In its latest update the president's office says that while at times Mr Mandela's condition becomes unstable, it tends to stabilise as a result of medical interventions.
"Doctors are still working hard to effect a turnaround and a further improvement in his health and to keep the former president comfortable," the statement said.
The update is the first in almost two weeks on the health of the Nobel Peace Prize laureate, Reuters reports.
News of Mr Mandela's hospitalisation in June attracted worldwide attention for the revered statesman, who is admired as a symbol of struggle against injustice and of racial reconciliation.
Mr Mandela celebrated his 95th birthday in hospital on July 18, showered with tributes from around the world.