Or did they and it is just not mentioned? If so why?
Hi, not discouraging new information, but FYI there are a couple of answers on this in the FAQ:
If the Vikings visited North America before 1492, was there any evidence that any population was wiped out (partially or otherwise) by small pox? by /u/Reedstilt
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