Amoebic Dysentery: Severe diarrhea with blood or mucus caused by amoebas. Giardiasis: An intestinal infection causing cramps, bloating, and watery diarrhea. Mixed Gastrointestinal Infections: Diarrhea or "stomach flu" caused by both bacteria and parasites. Urinary Tract Infections (UTIs): Specifically those resistant to single-antibiotic treatments. Pelvic Inflammatory Disease (PID): Infections of the female reproductive organs.