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.

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The Vatican No. 2 led faithful in a somber night-time prayer on Monday as Pope Francis continued to battle pneumonia in both lungs at a hospital in Rome.

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

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

According to the one-line morning bulletin Friday, “The night went well, this morning Pope Francis got up and had breakfast.” Francis was admitted to Rome's Gemelli hospital on Feb. 14 after a case of bronchitis worsened;

Vatican officials said that Pope Francis had developed pneumonia in both lungs, further complicating the pontiff's recovery.

Pope Francis has shown further slight improvement as he battles double pneumonia, but doctors said Wednesday his prognosis is still guarded. (AP video shot by Silvia Stellacci)

Pope Francis was a frequent visitor to Rome long before he became pope. Now his favorite shops and artisans are pulling for him as he battles double pneumonia.

Pope Francis continues to be in serious but stable condition as he concludes his 12th day in Rome’s Gemelli Hospital, the Vatican said Feb. 25. The pope was admitted to Rome’s Gemelli Hospital on Friday, Feb. 14, to undergo testing and treatment for bronchitis.

Pope Francis is being treated in hospital for double pneumonia — but what is this condition, and why might the pope be particularly vulnerable to it?