What does Pope Francis having "double pneumonia" mean? What should you look for in the elderly? How can you avoid getting pneumonia?

Pope Francis is "responding to therapy" for double pneumonia at a hospital in Rome but it not "not out of danger," the Vatican said Saturday.

"Is he out of danger? No. But if the question is 'is he in danger of death,' the answer is 'no," said the doctor of Pope Francis.