Where did Chicken Pox Come From?

Where did chicken pox come from? Chicken pox was first discovered by Giovanni Fillippo during the 1500's in Italy. Some doctors believed that it was a mild form of small pox but in the 1700's Dr. William Heberden proved that this virus was in fact not the same. You can find more information here: http://chickenpox.emedtv.com/chickenpox/history-of-chickenpox.html
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