The pope has been undergoing treatment for double pneumonia and a complex infection in a Rome hospital, and his condition has been alternating between improvements and setbacks. On Friday, Francis suffered a bronchial spasm that caused him to inhale his vomit after a coughing fit.

Pope Francis suffered two new acute respiratory crises Monday and was put back on noninvasive mechanical ventilation, in another setback to his battle to fight pneumonia, the Vatican said.

Pope Francis suffers two episodes of "acute respiratory insufficiency" and required "non-invasive" ventilation, the Vatican says.