Symbol of WHO (World Health Organization)

Have you ever notice the logo of World Health organization(WHO). There is a snake on a stick which is on the world map. as I noticed this, I started searching about it and came to know different theories about snake as a healer. First reference I will take from the Bible

Numbers 21: 4-8

4 They traveled from Mount Hor along the route to the Red Sea,[a] to go around Edom. But the people grew impatient on the way; 

5 they spoke against God and against Moses, and said, “Why have you brought us up out of Egypt to die in the wilderness? There is no bread! There is no water! And we detest this miserable food!”
6 Then the Lord sent venomous snakes among them; they bit the people and many Israelites died. 

7 The people came to Moses and said, “We sinned when we spoke against the Lord and against you. Pray that the Lord will take the snakes away from us.” So Moses prayed for the people.

8 The Lord said to Moses, “Make a snake and put it up on a pole; anyone who is bitten can look at it and live.”

https://www.biblegateway.com/passage/?search=numbers+21%3A4-8&version=NIV

Here we saw that God said Moses to make a snake and lift it up so who so ever will see it, will not die

The 

Some of the people relate WHO symbol with that serpent of Moses, which is not correct. WHO has its own description regarding the symbol of snake.

Snake on WHO logo mean

The The staff with the snake has long been a symbol of medicine and the medical profession.

It originates from the story of Asclepius who was revered by the ancient Greeks as a god of healing and whose cult involved the use of snakes. (Asclepius, incidentally, was so successful at saving lives that, the legend goes, Hades the god of the underworld complained about him to the supreme god Zeus who, fearing that the healer might make humans immortal, killed Asclepius with a thunderbolt.)

https://www.quora.com/What-does-the-snake-on-the-world-health-organization-symbol-represent

The Rod if Caduceus is often mistaken for the Rid of Ascelpius 
(especially in the US), except the Rod of Caduceus has a pair of

snakes intertwined with wings on the tops. The Caduceus is associated with Hermes and is the symbol of commerce, the two snakes signifying diligence and prudence. One day, Hermes cane across two snake fighting and touch then with his rod to get them to stop. The snakes intertwined the rod without fighting, demonstrating peace. Diligence, prudence, and peace are said to be good traits for commerce.

https://www.quora.com/What-does-the-snake-on-the-world-health-organization-symbol-represent