title: Letter: HBAg in breast milk.
mesh_terms: D001942:Breast Feeding; D005260:Female; D006509:Hepatitis B / Q000209:etiology* / Q000382:microbiology; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000209:etiology*; D008895:Milk, Human / Q000276:immunology*; D009500:Neutralization Tests; D011247:Pregnancy; D011863:Radioimmunoassay
chemical_list: D006511:Hepatitis B Antigens