Are booster doses of hepatitis B vaccine necessary?
D006509:Hepatitis B / Q000517:prevention & control*; D017325:Hepatitis B Vaccines; D006801:Humans; D007117:Immunization, Secondary; D014761:Viral Hepatitis Vaccines / Q000008:administration & dosage*
D017325:Hepatitis B Vaccines; D014761:Viral Hepatitis Vaccines