ROME (AP) — Pope Francis remained in critical condition Sunday and blood tests show early kidney failure but he remains alert and “well-oriented,” and attended Mass, the Vatican said, as the 88-year-old pontiff battles pneumonia and a complex lung infection.

In a late update, the Vatican said Francis hadn’t had any more respiratory crises since Saturday night but was still receiving high flows of supplemental oxygen.

Some blood tests showed “initial, mild, kidney failure,” but doctors said it was under control. The decreased platelet count, necessary for clotting, that was first detected Saturday was stable.

“The complexity of the clinical picture, and the necessary wait for drug therapies to provide some feedback, dictate that the prognosis remains reserved,” the doctors concluded.

Prayers for him poured in from around the world, from his native Argentina to the seat of Sunni Islam in Cairo to schoolchildren in Rome.

In New York, Cardinal Timothy Dolan admitted what church leaders in Rome weren’t saying publicly: that the Catholic faithful were united “at the bedside of a dying father.”

“As our Holy Father Pope Francis is in very, very fragile health, and probably close to death,” Dolan said at St. Patrick’s Cathedral, without saying if he had independent information about the pope’s condition.

Doctors have said Francis’ condition is touch-and-go, given his age, fragility and pre-existing lung disease. His condition has revived speculation about what might happen if he becomes unconscious or otherwise incapacitated, and whether he might resign.

Francis was supposed to have celebrated Mass on Sunday morning in St. Peter’s Basilica and ordained deacons as part of the Vatican’s yearlong Holy Year commemoration.

The organizer of the Holy Year, Archbishop Rino Fisichella, celebrated the Mass in his place and offered a special prayer for Francis from the altar before delivering the homily the pope had prepared.

“Even though he is in a hospital bed, we feel Pope Francis close to us. We feel him present among us,” Fisichella told the hundreds of white-robed deacons.

A pre-written message that had been prepared for Francis to read Sunday but did not deliver said he was “confidently continuing my hospitalization at the Gemelli Hospital, carrying on with the necessary treatment; and rest is also part of the therapy!” The message asked for prayers for him — as he always asks — and noted the upcoming anniversary of Russia’s invasion of Ukraine, “a painful and shameful occasion for the whole of humanity.”

Doctors have warned that the main threat facing Francis is sepsis, a serious infection of the blood that can occur as a complication of pneumonia. As of Friday, there was no evidence of any sepsis, and Francis was responding to the various drugs he is taking, the pope’s medical team said in their first in-depth update on the pope’s condition.

Francis developed a low platelet count, a condition called platelopenia or thrombocytopenia. Platelets are cell-like fragments that circulate in the blood that help form blood clots to stop bleeding or help wounds heal. Low platelet counts can be caused by a number of things, including side effects from medicines or infections.

Francis, who has chronic lung disease and is prone to bronchitis in winter, was admitted to Gemelli hospital on Feb. 14 after a weeklong bout of bronchitis worsened.

Doctors first diagnosed the complex viral, bacterial and fungal respiratory tract infection and then the onset of pneumonia in both lungs. They prescribed “absolute rest” and a combination of cortisone and antibiotics, along with supplemental oxygen when he needs it.