Pope Francis' doctors on Monday lited a "guarded prognosis" though he will need to remain in the "hospital setting for a period of time" in the treatment of double pneumonia, the Vatican said.

The 88-year-old pope has remained stable, with no fever and good oxygen levels in his blood for several days, doctors said.

Pope Francis was hospitalized on Feb. 14 after suffering a bout of bronchitis for weeks and after increasingly finding it hard to speak publicly.