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I have a classmate with a good relationship, who lives in a dormitory of the university. He has been living in a dormitory for 2 years. Because of the iron relationship, everyone usually lives and studies together. Some time ago, he found that he was unwell and went to the hospital to check for hepatitis. I was afraid that he might be infected if he was with him at ordinary times. What are the sources of hepatitis infection?

admin Changed status to publish 06/19/2022