ROME (AP) — Pope Francis is responding well to the treatment for double pneumonia and has shown a “gradual, slight improvement” in recent days, the Vatican said Saturday. But his doctors have decided to keep his prognosis as guarded, meaning that he’s not out of danger yet.

The 88-year-old pope, who has chronic lung disease and had part of one lung removed as a young man, has remained stable, with no fever and good oxygen levels in his blood for several days, doctors reported in a Vatican statement.