Fall diarrhea is a diarrhea that develops mostly in autumn and winter, mainly due to rotavirus. It has a rapid onset and is often associated with fever and upper respiratory tract infection symptoms, without obvious toxic symptoms. It occurs mostly in infants and children aged 6 months to 2 years, and is rare in those aged 4 years or older. The disease is spread by fecal-oral transmission and can also be caused by respiratory infection in the form of aerosols. The incubation period is l to 3 days. There are three main clinical features of fall diarrhea, i.e., cold, vomiting, and diarrhea. There is no specific drug for rotavirus. Clinical manifestations: the onset of the disease is rapid, often accompanied by fever, runny nose and cough and other symptoms of respiratory tract infection. The onset of the disease is 1-3 days after infection with the virus, and vomiting is almost always present at the beginning of the disease and lasts for 2-3 days, often preceding the onset of diarrhea. The diarrhea appears 2 days after the disease, and the course of the disease is 3-4 days for the extreme stage, the stool is more frequent, about 10 times a day, the amount is large, watery stool or egg-like stool, green or creamy white, there may be a small amount of mucus, no fishy odor. Most children have fever, with a temperature between 38-40°C for 1-4 days. The disease is self-limiting, with a natural course of about 1 week. Treatment principles: prevention of dehydration, correction of dehydration, continuation of diet, and rational use of medication. Children with mild disease and no obvious dehydration can be treated at home. Severe cases need to be treated in hospital. Etiological treatment: There is no real drug to kill rotavirus. Since it takes about 5-7 days to repair the epithelial cells of the small intestinal mucosa after they are shed, the course of autumn diarrhea is about 5-7 days. Diet: Severe vomiting can be suspended for a few hours. The following liquids can be used: 1. Rice broth with salt solution: Preparation: 500ml of rice broth (1 pound bottle) + 1.75g of fine salt (half of a flat beer bottle cap). Prevention of dehydration: first give 20-40ml/kg, a small number of times orally, finished within 4 hours, later at any time orally, how much can drink to give. 2, sugar and salt water: preparation method: 500ml of plain water (1kg bottle) + 10g of cane sugar (2 small spoons) + 1.75g of fine salt (half of a flat beer bottle cap). Dose serving method is the same as above. 3, oral rehydration salts (ORS) (caution for newborns), it is appropriate to feed a small number of times, children under 2 years of age every 1 to 2 minutes to feed 1 small spoon about 5ml; older children can drink directly from a cup. If the child vomits, stop for 10 minutes and then slowly feed the child (one spoonful every 2 to 3 minutes). The degree of dehydration is not obvious, ORS dilution is twice as large as conventional, that is, usually diluted with only 500ML of water, increased to 1000ML of warm boiled water. This water can also be used to make formula (special formula for diarrhea) and drink as much as you want, suspending all other foods. Other treatment: use Simethicone treatment, which can adsorb and fix pathogenic bacteria and toxins, then excreted with feces, and has a hemostatic effect. Microecological preparations, which are not ideal for acute diarrhea and are not routinely used, are indicated for children with prolonged and chronic diarrhea with significant intestinal flora disorders. Durabal (enkephalinase inhibitor, abscisicadotril) may be effective in diarrhea caused by viruses that pass large amounts of watery stools.