I know the viking presence in North America was very limited and restricted to the more remote regions in the north east but I have also heard that trade did occur between the two peoples. I was wondering if there is any evidence of diseases being transmitted in this exchange either in the European sources or indigenous oral histories ? As a side question, is there any recorded presence of Vikings in indigenous stories from those areas ? I know some oral histories have been found to be surprisingly close to modern narratives on past events, such as the coast Salish stories which match up closely to the crossing of the Bering strait.