title: Lack of transmission of hepatitis B in a day care center.
mesh_terms: D002353:Carrier State; D002656:Child Day Care Centers; D006509:Hepatitis B / Q000635:transmission*; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006801:Humans; D007223:Infant; D008297:Male; D012306:Risk; D012463:Saliva / Q000276:immunology
chemical_list: D006514:Hepatitis B Surface Antigens