The Vatican has cancelled Pope Francis's weekend engagements.
The 88-year-old has been in hospital since Friday for bronchitis treatment.
On Monday, the Vatican said his respiratory tract infection was presenting a "complex clinical picture" and he would need to remain in hospital.
That evening, the Vatican said the Pope was in a "stable" condition with no fever.
Concerns have been growing about the pontiff's increasingly frail health.
Francis, who has been pontiff since 2013, has had influenza and other health problems several times over the past two years.
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