Hepatitis B control in African countries.
D000349:Africa; D000367:Age Factors; D002353:Carrier State / Q000517:prevention & control* / Q000635:transmission; D002648:Child; D006509:Hepatitis B / Q000517:prevention & control* / Q000635:transmission; D006513:Hepatitis B e Antigens / Q000276:immunology; D006801:Humans; D014611:Vaccination / Q000191:economics
D006513:Hepatitis B e Antigens