What is Pope Francis currently being treated for, and how did his health condition develop?

Pope Francis is being treated for pneumonia affecting both of his lungs, according to a Vatican update released on Tuesday. This diagnosis follows his hospital admission on Friday, when he was initially diagnosed with bronchitis that has now progressed to a more serious respiratory infection. The Pope's health situation has evolved from a bronchial condition to pneumonia, requiring ongoing medical attention. CBS News senior foreign correspondent Seth Doane is providing updates on the pontiff's condition as treatment continues for this significant respiratory illness.