If the vomiting is not severe, fasting is not necessary for the time being. If there is frequent vomiting, it is necessary to fast temporarily for 4-6 hours, but not to fast from water, and wait for the vomiting to improve, then gradually feed liquid or semi-liquid food, such as rice soup, congee, noodles, etc., in small amounts and several times. For diarrhea, you can take probiotics such as Saccharomyces boulardii and Bifidobacterium bifidum to regulate the intestinal tract. Take oral rehydration salts about 150ml after each stool until the diarrhea and vomiting stop. Also need to send stool for examination, stool routine, stool rotavirus, stool norovirus test, if stool test found to have red blood cells, white blood cells, pus cells, suggesting intestinal bacterial infection, you need to take amoxicillin and cephalosporin anti-inflammatory drug treatment. If the stool test has rotavirus or norovirus, there is no special antiviral treatment, mainly to supplement fluids and regulate the intestinal tract.