Berlin (dpa) – Some public toilets are so dirty and smelly that many people feel like turning around and running back out the moment they open the cubicle door. But when nature calls, there's usually no choice. Even the most disciplined bladder or bowel has a breaking point – and attempting negotiations rarely ends well. The strategy is often to take a deep breath and push through the disgust. And that reaction is perfectly normal. "Mother Nature doesn't want us humans to become infected with pathogens," says Markus Egert, professor of microbiology and hygiene at Furtwangen University. "That's why we have an innate aversion to two things – corpses and faeces." But how high is the risk of catching a stomach bug in a public toilet? There are no studies showing how many infections actually or

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