title: Vaccine challenges, in addition to delivery, include new formulations, better administration.
authors.forename: J W
authors.initials: JW
authors.lastname: Zylke
mesh_terms: D019433:Chickenpox Vaccine; D015721:Diphtheria-Tetanus-Pertussis Vaccine / Q000009:adverse effects; D014645:Herpesvirus 3, Human; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D014612:Vaccines / Q000008:administration & dosage*; D014761:Viral Hepatitis Vaccines; D014765:Viral Vaccines
chemical_list: D019433:Chickenpox Vaccine; D015721:Diphtheria-Tetanus-Pertussis Vaccine; D014612:Vaccines; D014761:Viral Hepatitis Vaccines; D014765:Viral Vaccines