Clostridium difficile
Some cases of C. diff infection are not very serious.  In other cases, people get very sick and even die. When people experience severe diarrhea from C. diff infection, they may become badly dehydrated (not have enough fluid in their bodies).  This can damage the kidneys leading to renal failure.  C. diff bacteria can also eat a hole in the intestines (perforation), which is very dangerous.