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While rare, the disease can be lead to respiratory failure in some cases.

Pope Francis has remained stable after suffering two episodes of respiratory failure on Monday.

In its nightly update, the Vatican said the Pope did not present any further episodes of respiratory failure or bronchospasm.

Pope Francis is alert after suffering two episodes of "acute respiratory failure" on Monday afternoon, the Vatican has said.

Suddenly, her arms and legs became weak, and by the time she got to a hospital in Indianapolis, she was totally paralyzed and in respiratory failure.