In a statement on Monday evening, the Vatican said: "The clinical conditions of the Holy Father, in their critical state, show a slight improvement.
Oxygen therapy continues, although with slightly reduced flow and oxygen percentage"The doctors, considering the complexity of the clinical picture, are prudently not releasing the prognosis yet.
Pope Francis's health has shown a "slight improvement" but he remains in a critical condition, the Vatican has said.
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The Pope, 88, has been at Rome's Gemelli Hospital since 14 February and is being treated for double pneumonia and chronic bronchitis.