Hepatitis can be divided into viral hepatitis, steatohepatitis, drug hepatitis, alcoholic hepatitis and other types according to the causative factors, among which viral hepatitis is contagious. The common clinical viral hepatitis are hepatitis A, hepatitis B, hepatitis C, hepatitis D and hepatitis E. These five types are caused by different hepatitis virus infections, and the infectiousness and mode of transmission are different. 1, hepatitis A: hepatitis A can be transmitted through fecal-oral transmission, that is, mainly through the gastrointestinal tract, daily contact transmission is the main mode of transmission, such as contact with the virus infected water and food for transmission, people who have suffered from People who have had hepatitis A or have been infected with the hepatitis A virus can acquire lasting immunity; 2. Hepatitis B: It can be transmitted through mother and child, blood and blood products, broken skin mucous membranes, and sexual contact. Hepatitis B patients and virus carriers are the main source of infection; 3, hepatitis C: viral hepatitis caused by hepatitis C virus infection, mainly through blood transfusions, needle sticks, drug use, etc.; 4, hepatitis D: mainly through blood transfusions and blood products, similar to the mode of transmission of hepatitis B, but also through mother and child, broken skin mucous membrane transmission; 5, hepatitis E: transmission characteristics similar to hepatitis A, through the fecal-oral route It is most commonly transmitted by water-based epidemics, with a small number of food-based outbreaks, or daily contact transmission.