you don't know something! ! Hepatitis A is an infectious disease of digestive tract. After being infected, the prognosis is basically good, and there is no chronicity. Once infected with hepatitis A, the body itself can produce antibodies after healing! Many people have actually been infected with hepatitis A, but many of them automatically recovered unconsciously and produced antibodies! Only a few people have serious abnormal liver function and need to be hospitalized! ! For example, people who often eat seafood along the coast, for example, basically most people have been infected with hepatitis A and produced antibodies! And hepatitis B is really different, mainly because it may be chronic, and once chronic, the prognosis will be bad! ! Because the mother-to-child transmission of hepatitis B infection is basically carried for life, it is likely to develop into chronic hepatitis B; Children without antibodies, especially infants and young children, are also more likely to become chronic after being infected with hepatitis B virus. Adults infected with hepatitis B virus are less likely to become chronic! ! Because the treatment of chronic hepatitis B is very complicated and difficult, and the treatment cycle is quite long (ranging from a few months to several years to decades), most chronic hepatitis B will enter the road of hepatitis-cirrhosis-liver cancer, but the individual is different and the degree is different! Therefore, hepatitis B has more serious consequences than hepatitis A, and hepatitis B virus can be basically blocked by vaccines, especially for infants and young children! ! So hepatitis B vaccine is legal and free! !