Legal basis: Article 13 of the Health Certificate Handling Service Guide allows hepatitis B virus carriers to engage in the food industry. Therefore, hepatitis B virus carriers can also legally apply for health certificates. Health certificate examination items: routine medical examination and surgical examination; Liver function (alt); Stool culture (dysentery, typhoid Bacillus), chest fluoroscopy. Application conditions: Health certificate refers to those who produce and sell food and drinking water, those who directly engage in cosmetics production, those who directly serve customers in public places, hazardous workers, radiation workers, school students, etc. According to the national health laws and regulations, before, during and after employment.