生蛇
生蛇係由水痘病毒引發嘅皮膚病，只要舊時出過水痘，病毒就會一直潛伏響身體入面，當年紀大抵抗力差，就有機會中招。
病毒通常會潛伏喺位於神經系統嘅背根節，咁就解釋到水痘帶狀皰疹病毒嘅復發會呈現蛇形，係由於大量嘅病毒顆粒喺神經線周圍產生所造成嘅免疫反應。
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