The Vatican says Pope Francis is resting after a quiet night. Monday is the 10th day of his hospitalization for a complex lung infection that has provoked the early stages of kidney failure.

Pope Francis remains in critical condition, according to the Vatican, with blood tests showing mild signs of kidney failure “which is currently under control,” the Vatican said Sunday, as the 88-year-old pontiff battles pneumonia in both his lungs.

The kidney ailment appears to be in an early stage, the Vatican said, adding that the pontiff is still receiving high flows of oxygen for his respiratory illness.