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Published 21:14 3 Dec 2015 GMT

We feel the same...
According to Scientific America, Enterococcus bacteria, "a typical marker of human fecal contamination", was found in nine of the ten machines.
Another type of bacteria found in the coffee machines tested was Pseudomonas, which has "both benign and pathogenic strains".
It is important to remember that the coffee isn't at risk but we're going to be cleaning the drip trays after each use in future nonetheless.Explore more on these topics: