title: Varicella and herpes zoster: comparisons in the old and young.
mesh_terms: D000328:Adult; D000367:Age Factors; D002644:Chickenpox / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D006562:Herpes Zoster / Q000209:etiology; D006566:Herpesviridae Infections; D014645:Herpesvirus 3, Human; D006801:Humans; D007223:Infant