Pope Francis, battling double pneumonia in hospital, is in a stable condition and has shown "slight improvement" in results from recent blood tests, the Vatican said on Wednesday. The 88-year-old pontiff is undergoing treatment at Rome's Gemelli hospital,

As Pope Francis battles dangerous lung infection, here’s what you need to know about the causes, symptoms, prevention tips and treatment of double pneumonia.

The Vatican says Pope Francis will remain hospitalized after a chest scan of the 88-year-old pontiff shows he is battling double pneumonia, an infection in both lungs. It comes as people from all over the world have gathered outside the hospital to offer their prayers to him.