Could Scandinavian invaders, know as the Vikings, have introduced leprosy to Ireland?
Leprosy brought to Ireland by Vikings, according to new evidence - science news articles with summaries

Little is known about leprosy in medieval Ireland, therefore a team of scientists studied the skeletons of five ancient humans with leprosy, from cemeteries around Dublin, to understand more.

The scientists performed genetic analyses of the leprosy bacterium (M. leprae) strains and discovered that the subjects had probably two different strains of leprosy, one originating in Scandinavia and one from the Middle East, but also present in Scandinavia.

From the five individuals, two grew up in Scandinavia and the remaining three did not seem to have been locals from Dublin. The researchers concluded that all evidence points towards Vikings introducing leprosy to Ireland.

Read the full story: University of Southampton
Scientific publication: PLoS ONE