1, the definition and etiology of autumn and winter diarrhea: autumn and winter diarrhea, also known as “rotavirus enteritis”, is caused by rotavirus through the respiratory or digestive tract infection, with the gradual warming of the climate, the disease from 30 years ago the onset of autumn gradually delayed to late winter season or even early spring onset, with regional epidemic. Recently, the incidence is higher in Weifang. 2, clinical features: mostly seen in the under 2 years old, especially within 1 year old, the onset of the disease is urgent, first fever, runny nose similar to the performance of the upper sense, the temperature can be more than 39 degrees, followed by vomiting several times, diarrhea within half a day, each stool volume, part of the jet, stool is watery, or egg flower soup-like, no odor, slightly fishy, 3-5 times a day or more, the temperature is mostly reduced to normal within 48 hours. Children often have weight loss, reduced urine output, dry skin and lips, poor mental health and other signs of dehydration. The natural course of the disease is 5-8 days. 3.Treatment: Rotavirus is parasitized in the epithelial cells of the mucous membrane of small intestine and is excreted with the elimination of stool, so antiviral drugs are not important. If the spirit is still good and there is no vomiting after eating, you can take oral rehydration, such as oral rehydration salt, feed light saline in small amounts several times, drink millet porridge or rice flour, steamed buns dipped in vegetable soup, etc. When abdominal distension, consider potassium supplementation, such as feeding heated fresh orange juice. Pay attention to the diet in small amounts and many times, avoid drinking milk powder, avoid eating fish, shrimp, eggs and milk, and ensure that the urine volume is similar to normal. If the diarrhea is serious, poor in spirit and accompanied by vomiting, intravenous rehydration should be given. Pay attention to abdominal ultrasound when abdominal pain is severe to prevent the occurrence of intussusception. In addition, you can take probiotics, paediatric diarrhea stop, Dulabao, spleen nourishing child granules, montmorillonite suspension and other symptomatic treatment to promote recovery.