Pope Francis remains on daily oxygen therapy during his third week in the hospital, with his prognosis still "guarded," the Holy See Press Office said in a Saturday update. Francis has been critically ill with double pneumonia and chronic bronchitis after being admitted to Rome's Gemelli Hospital on February 14.

The pope "rested well" and woke shortly after 8 a.m. Wednesday morning, his 20th day in the hospital, the Vatican said.

Pope Francis, hospitalized for more than two weeks with pneumonia in both lungs, suffered two acute respiratory failures, requiring intervention, the Vatican says.