Zoster is more than 'just' a viral infection.
Mandell
Brian F
BF
D001167:Arteritis / Q000209:etiology; D006562:Herpes Zoster / Q000276:immunology*; D006566:Herpesviridae Infections / Q000150:complications* / Q000276:immunology; D014645:Herpesvirus 3, Human / Q000276:immunology*; D006801:Humans