Importance of family contacts of HAA-positive persons.
D000368:Aged; D002648:Child; D005260:Female; D006506:Hepatitis A / Q000235:genetics / Q000517:prevention & control*; D006511:Hepatitis B Antigens; D006515:Hepatitis B virus / Q000276:immunology*; D006801:Humans; D008297:Male; D008875:Middle Aged
D006511:Hepatitis B Antigens