I interest on the global disease of Diarrhea because Diarrhea kills around 760 million children under five each year, which means our immune system’s develop and the disease’s dangerous. The food hygiene is the main host of Diarrhea, but sometimes you can get Diarrhea with your hands and nose, not just your mouth. Some alive animal can cause Diarrhea too. So when people get Diarrhea, what medicine can help the immune system, and the durations are the immune system’s defense or the disease’s fatal damages?