At present, most areas to do health certificates are not required to check hepatitis B, including the Guangdong Province, for example, the catering industry health certificate physical examination, the requirements of several aspects: First, to carry out general medical and surgical examination, including liver, spleen palpation and skin examination. Second, blood needs to be drawn to check the liver function in the glutathione transaminase to exclude acute hepatitis. Third, a stool culture is needed to rule out dysentery and typhoid, which are intestinal infectious diseases. Fourth, a chest x-ray is needed to rule out tuberculosis.