The list of diseases that Europeans brought over:
bubonic plague
chicken pox
cholera
common cold
diphtheria
influenza
leprosy
malaria
measles
scarlet fever
smallpox
typhoid
typhus
whooping cough
yellow fever
yaws
It seems that the Native Americans got the short end of the stick on this one. The only notable disease that the Europeans got introduced to, was Syphilis. But boy did they pick one with lasting power