Medically reviewed by Anju Goel, MD Key Takeaways Diarrhea is often contagious, especially when it's caused by viruses, bacteria, or parasites. Infectious diarrhea can spread by not washing hands ...

NEW YORK (Reuters Health) - If you give your kids kefir to prevent the diarrhea they often get when they take antibiotics, here's some news for you: if your kids are otherwise healthy, it probably won ...