Pope Francis remains in critical condition, with blood tests showing mild signs of kidney failure.
“The complexity of the clinical picture, and the necessary wait for pharmacological therapies to provide some feedback, require that the prognosis remain reserved,” the Vatican said.
The Vatican confirmed that the Pope was admitted to a Rome clinic on February 14 for tests related to a respiratory infection.
A later CT scan revealed that he had pneumonia in both lungs, requiring further medical attention.
Despite his condition, Francis participated in the Holy Mass from his hospital apartment on Sunday morning.
The Vatican reported that the Pope received high flows of oxygen after a respiratory crisis but had a peaceful night.
Due to his hospitalization, he missed the weekly Angelus prayer for only the third time in his 12-year papacy.
Pope Francis has a history of respiratory issues, having previously suffered pneumonia as a young man, which led to the removal of part of one lung.