The pontiff's condition is touch-and-go, given his age, fragility and pre-existing lung disease, according to doctors.
Members of London's Catholic community say they're praying in solidarity for Pope Francis as the 88-year-old pontiff is still in hospital where he remains in critical condition on Sunday.
Renewed interest in Vatican tradition on back of Conclave winning at the Baftas and updates on Pope Francis’ health
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.
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