Fever and diarrhea are often associated with acute gastroenteritis, which is caused by viral or bacterial infections that cause damage to the gastrointestinal mucosa. Bacterial infections are more common, while viral infections are mainly seen in infants and children between the ages of 1-2 years. If a viral infection occurs, the stool routine or blood test often does not have elevated white blood cells, and treatment with anti-viral drugs and anti-diarrheal drugs is more effective, such as black bean and fever pellets and Similac. In addition, if the temperature of fever is high, above 38.5 degrees, you need to use ibuprofen suspension to reduce fever. If there is an elevation of white blood cells in the blood or stool routine, it is a bacterial infection causing inflammation of the gastrointestinal mucosa, resulting in fever and diarrhea, which needs to be treated with antibiotics. For adults, norfloxacin is recommended; for children, pediatric cefixime granules are recommended.