Almost 10% of Swiss and foreign cheese samples tested in Switzerland by cantonal authorities failed to meet the hygiene criteria prescribed by Swiss regulations. Those made from raw milk were the worst offenders.

The results of the tests were released on Monday by the Swiss Association of Cantonal Chemists, who tested a total of 560 cheeses sold all over Switzerland in 2014. While a reassuring 91% of the samples met the legal requirements concerning hygiene, the same could not be said of the rest, which showed traces of certain bacteria like E. coli when tested.