title: [The study of the routes of transmission of viral hepatitis B].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006509:Hepatitis B / Q000635:transmission*; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged