title: Hepatitis A vaccine: evidence of efficacy after exposure.
mesh_terms: D003140:Communicable Disease Control / Q000379:methods; D004739:England / Q000453:epidemiology; D006506:Hepatitis A / Q000453:epidemiology / Q000276:immunology / Q000517:prevention & control*; D006507:Hepatovirus / Q000276:immunology*; D006801:Humans; D015994:Incidence; D016032:Randomized Controlled Trials as Topic; D014761:Viral Hepatitis Vaccines / Q000008:administration & dosage*
chemical_list: D014761:Viral Hepatitis Vaccines