Biggest study of its kind
The people studied had been tourists in countries outside the Nordic region. The risk was greatest among those who had travelled to India, but other parts of Asia and North Africa also figure prominently in the results.
The still unpublished follow-up shows that most quickly got rid of their unwanted travel companions. One year after returning home, only a few people were still carrying the resistant intestinal bacteria.
Travel-associated faecal colonization with ESBL-producing Enterobacteriaceae: incidence and risk factors by Å. Östholm Balkhed, M. Tärnberg, M. Nilsson, L. E. Nilsson, H. Hanberger and A. Hällgren. Journal of Antimicrobial Chemotherapy 2013.