憂鬱症不見得是心因性, 有可能是因為人類皰疹病毒感染所引起的後遺症之一:

台灣本地研究:皮蛇(帶狀皰疹)會增加憂鬱症罹患機率!

人類皰疹病毒 6B 引發實驗鼠憂鬱症狀實驗:
Human Herpesvirus 6B Greatly Increases Risk of Depression by Activating Hypothalamic-Pituitary -Adrenal Axis during Latent Phase of Infection

單純皰疹病毒感染與憂鬱症:
Herpes simplex virus infection and depressive illness

精神病性抑鬱症患者的單純皰疹病毒補體結合抗體:
Complement fixing antibody to herpes simplex virus in patients with psychotic depression

抑鬱症和單純皰疹病毒感染
Depression and Herpex simplex infections

精神病性抑鬱症患者對單純皰疹病毒的抗體和細胞介導免疫
Antibody and cell-mediated immunity to herpes simplex virus in psychotic depression

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看樣子, 我這個慢慢上了年紀的山賊, 還是找時間自費打個帶狀疱疹疫苗好了........