點解世衞個logo 有條蛇既?

蛇 代表了藥物
From http://drblayney.com/Asclepius.html:
[...] Professional and patient centred organisations (such as the NZMA, in fact most medical Associations around the world including the World Health Organization) use the "correct" and traditional symbol of medicine, the staff of Asclepius with a single serpent encircling a staff, classically a rough-hewn knotty tree limb. Asclepius (an ancient greek physician deified as the god of medicine) is traditionally depicted as a bearded man wearing a robe that leaves his chest uncovered and holding a staff with his sacred single serpent coiled around it, (example right) symbolizing renewal of youth as the serpent casts off its skin. The single serpent staff also appears on a Sumerian vase of c. 2000 B.C. representing the healing god Ningishita, the prototype of the Greek Asklepios. However, there is a more practical origin postulated which makes sense.

2007-01-17 02:21:17 補充：
對唔住打錯左蛇圍住支棒先係代表藥物古希臘既文化裡Asclepius, (醫神,即醫生) 就係楂住一支被蛇圍住既棒 (the staff of Asclepius)圖片:http://drblayney.com/Asclepius.html

http://zhidao.baidu.com/question/6329651.html?md=3