Pope Francis's condition showed "a further, slight improvement", the Vatican said Wednesday, while continuing to maintain the prognosis for the 88-year-old fighting pneumonia in both lungs was "reserved".

Pope Francis was found to have pneumonia in both his lungs Tuesday and his condition remains "complex," the Vatican said in a health update on the 88-year-old pontiff who was hospitalized last week. The big picture: The pope was admitted to Rome's Agostino Gemelli Hospital on Friday with bronchitis symptoms and his treatment was changed after doctors found he had a polymicrobial infection of the respiratory tract.