The common infectious diseases in summer are mainly intestinal infections. Intestinal infections are caused by various pathogens discharged from the feces and vomit of patients and pathogen carriers, which contaminate the surrounding environment, and then enter the gastrointestinal tract through the mouth via water, food, hands, flies, cockroaches, etc. They multiply in the human body, produce toxins and become ill, and finally discharge the pathogens, which are then transmitted to others. Common intestinal infections in summer include bacteriophage, cholera, amoebic dysentery, typhoid or paratyphoid, hepatitis A, hepatitis E and other infectious diarrhea. People who generally go out to dine and play are prone to intestinal infections. Therefore, it is important to maintain hand hygiene and pay attention to food hygiene and safety in the summer to avoid contracting intestinal infections.