Hi, not discouraging new/more/deeper info here, but fyi there have been some in-depth discussions on this topic. Check out the FAQ section Americas Before Columbus and Native American History | Disease in the Americas | Impact of indigenous diseases on the Europeans :

• One of the main reasons Europeans were so utterly victorious against Native Americans was the introduction of diseases, that decimated the population. Why did the Norsemen of Vinland not bring diseases that carried the same effect? by /u/anthropology_nerd

• I am a native american living in the 1600s, someone in my village has just contracted small pox. What happens next? by /u/anthropology_nerd

• When Europeans brought diseases to the new world, how come Europeans themselves didn't get sick from diseases specific to the new world? by /u/anthropology_nerd

• Why weren't European settlers in North America decimated by disease like the native populations? by /u/400-Rabbits