What is a polymicrobial respiratory tract infection? Essentially, it means there’s a mix of bacteria, viruses, fungi, or parasites growing in someone’s lungs. "Often times, pe

Vatican authorities said Monday that Pope Francis has a complex infection in his respiratory system and will require more targeted drug treatment.

Francis was serene after arriving at Rome’s Gemelli hospital after presiding over his morning audiences, Vatican spokesperson Matteo Bruni said.