Pope Francis is responding well to treatment and has shown a "gradual, mild improvement" in recent days as he remains in the hospital recovering from double pneumonia, the Vatican said Sunday."The night was quiet; the Pope is resting," the Vatican said in a statement.Francis, 88, was admitted to Rome's Gemelli Hospital on Feb. 14 after a week-long bout of bronchitis worsened. Doctors first diagnosed the complex viral, bacterial and fungal respiratory tract infection and subsequently the onset of pneumonia in both lungs.POPE FRANCIS SHOWS 'SLIGHT IMPROVEMENT' DURING FOURTH WEEK IN HOSPITAL, VATICAN SAYSThis is the fourth Sunday in a row