A medical history question

Are you saying Natives gave Euros syphilis or the other way around? I took a microbiology class years ago and the instructor advised syphilis is present in sheep and does not affect them. Some sheppard in the mid east or Greece or somewhere in that region of the world probably got lonely one nite and shagged a sheep and then went home a shagged a few of the locals, and what do ya know, we have syphilis.
Either/or/both.

History

There are two thoughts on the origin of syphilis: the Columbian and pre-Columbian theories. There are ongoing debates in anthropological and historical fields about the validity of either theory.
The pre-Columbian theory holds that syphilis symptoms are described by Hippocrates in Classical Greece in its venereal/tertiary form. Some passages in the Bible could refer to syphilis, especially Exodus 20:5 where the sins of the father are visited unto the third and fourth generation. There are other suspected syphilis findings for pre-contact Europe, including at a 13-14th century Augustinian friary in the northeastern English port of Kingston upon Hull. The anthropological evidence is contested by those who follow the Columbian theory.
The Columbian Exchange theory holds that syphilis was a New World disease brought back by Columbus. The first well-recorded outbreak of what we know as syphilis occurred in Naples in 1494. There is some documentary evidence to link Columbus's crew to the outbreak. Supporters of the Columbian theory find syphilis lesions on pre-contact Native Americans. Again, all the anthropological evidence is heatedly discussed on both sides of the Columbian/pre-Columbian debate. (Baker, et al.)
Alfred Crosby has argued that neither side has the full story. Syphilis is a form of Yaws, which has existed in the Old World since time immemorial. Crosby argues that syphilis is a specific form of Yaws that had evolved in the New World and was brought back to the old, "the differing ecological conditions produced different types of treponematosis and, in time, closely related but different diseases". (ref:225 Crosby)



http://en.wikipedia.org/wiki/Syphilis