Revaccination against hepatitis B.
D006509:Hepatitis B / Q000517:prevention & control*; D017325:Hepatitis B Vaccines; D006801:Humans; D007117:Immunization, Secondary / Q000379:methods*; D014761:Viral Hepatitis Vaccines / Q000008:administration & dosage*
D017325:Hepatitis B Vaccines; D014761:Viral Hepatitis Vaccines