Vatican says the pope has a 'polymicrobial respiratory tract infection.' What is that?

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Nuns sit next to a statue of Pope John Paul II in front of the Agostino Gemelli Polyclinic, in Rome, Monday, Feb. 17, 2025, where Pope Francis has been hospitalized to undergo some necessary diagnostic tests and to continue his ongoing treatment for bronchitis. (AP Photo/Andrew Medichini)