Since the summer heat has just passed, parents are still in fear of summer infectious diseases, especially toxic dysentery. The baby has frequent diarrhea after sudden fever, coughing and vomiting, with many stools (up to dozens of times), and the child quickly becomes dehydrated and acidotic, so it is easy to imagine that it is bacterial diarrhea or toxic dysentery. In fact, autumn diarrhea in infants and young children is mainly a viral diarrhea caused by “rotavirus”, which occurs from October to February and is most common at the age of 6 months to 2 years. The main culprit of fall diarrhea is rotavirus, and there is no specific medicine for rotavirus. The use of antibiotics is ineffective. Rotavirus is highly contagious and can occur throughout the year, with the peak of infection in the fall and winter, hence the name “fall diarrhea”. The disease is prevalent throughout China, as well as in Europe, Asia, the United States, Australia, and Africa. Infants and young children who are infected with the disease usually show clinical symptoms mainly of acute gastroenteritis, i.e. watery diarrhea, which can be accompanied by fever and vomiting, and the diarrhea is mostly yellow-green egg-flower-like thin watery stools. Rotavirus can not only cause gastrointestinal symptoms, but also cause other organ lesions in the body, such as encephalitis, myocarditis, etc.