Pope Francis suffered an isolated coughing fit on Friday that resulted in him inhaling vomit, requiring non-invasive mechanical ventilation, the Vatican said in relaying a setback in his two-week long battle against double pneumonia.

Pope Francis reached the two-week mark recovery from pneumonia Friday as doctors suggested he had overcome the most critical phase of the infection while holding out on declaring him out of danger entirely.

Loredana Sarmati warned that pneumonia is a "major serious illness...even in young people". She added that "It is unlikely that this situation will be resolved within days for the pope, I think it will take weeks.

Pope Francis was in critical condition Saturday after he suffered a prolonged asthmatic respiratory crisis while being treated for pneumonia and a complex lung infection, the Vatican said. The 88-year-old pope,

Pope Francis marked the one-week point Friday in his hospital stay, getting up and out of bed to eat breakfast as the 88-year-old pontiff continued fighting pneumonia and a complex respiratory

Pope Francis, who has been hospitalized for more than a week, remains in “critical” condition and developed an “asthmatic respiratory crisis” earlier on Saturday, the Vatican said in a statement.

Pope Francis, who has been hospitalized for more than a week, had a peaceful night which “passed quietly” after suffering from a respiratory crisis on Saturday, the Holy See Press Office said Sunday morning.

The Vatican late Thursday reported a “slight improvement” in his overall clinical condition, with his heart working well.

Doctors say pneumonia in such a fragile, elderly patient makes him particularly prone to complications given the difficulty in being able to effectively expel fluid from his lungs

There has long been a Vatican taboo against openly talking about a conclave when a pope is sick: It’s considered gauche to speculate about the election of a new pope while the current one is fighting for his life.

The head of the Catholic Church has been in hospital for over two weeks fighting double pneumonia. The Vatican said the pontiff had suffered an "isolated breathing crisis" on Friday.