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BACKGROUND : Combined hepatitis B immune globulin ( HBIg ) and lamivudine in prophylaxis of the recurrence of hepatitis B after liver transplantation has significantly improved the survival of HBsAg positive patients .
 Disease: hepatitis B; Chemical: lamivudine; Disease: hepatitis B; Chemical: HBsAg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: hepatitis B; Chemical: lamivudine; Disease: hepatitis B; Chemical: HBsAg