Andie Fontaine of Grapevine writes that 16 children have been diagnosed with E. coli, and concerns have been raised that tourists may spread it further, RÚV reports.

The outbreak is purported to have originated in Efstadal 2, a farm and restaurant near Laugarvatn, after a group of school children visited the place, with some of them contracting E. coli. To be clear: none of the food nor any of the employees tested positive for E. coli. Rather, it is all but certain the bacteria originated from the faecal matter of calves on the farm.

Health authorities have pointed out that there are many rural restaurants in Iceland that are located near farms, prompting a more thorough investigation into stopping the infection’s spread. Further, these locations are visited by many tourists, which could potentially increase the risk of spreading E. coli.