title: Letter: Active immunisation against varicella.
mesh_terms: D002644:Chickenpox / Q000517:prevention & control*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007110:Immunity, Active; D007114:Immunization; D007223:Infant; D007271:Injections, Intradermal; D014765:Viral Vaccines / Q000008:administration & dosage
chemical_list: D014765:Viral Vaccines