Pope Francis experienced “two episodes of acute respiratory failure,” the Vatican said Monday, marking the latest in a series of medical crises the 88-year-old pontiff has endured since he was first hospitalized last month.

Pope Francis suffered two episodes of acute respiratory insufficiency and went back on a ventilator as he remains hospitalized for double pneumonia, the Vatican said Monday night.

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