title: When should at-risk patients with thalassaemia be boosted with hepatitis B vaccine?
mesh_terms: D017325:Hepatitis B Vaccines; D006801:Humans; D007117:Immunization, Secondary; D012306:Risk; D013789:Thalassemia; D014761:Viral Hepatitis Vaccines / Q000008:administration & dosage*
chemical_list: D017325:Hepatitis B Vaccines; D014761:Viral Hepatitis Vaccines