Heartworms (Dirofilaria immitis) are parasitic roundworms that infest the heart and lungs of dogs. The disease caused by these parasites is called dirofilariasis. It is one of the most serious and ...

According to officials, the 88-year-old pope is suffering from a polymicrobial respiratory tract infection—a mix of bacteria, viruses, fungi, or parasites growing in someone’s lungs.