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The aim of cleaning, then, should be to reduce bacteria numbers__ut not to zero. Even harmful bacteria can be good for us when the immune system uses them for training. A couple of thousand Salmonella bacteria in the kitchen sink are a chance for our immune system to do a little sightseeing. They become dangerous only when they turn up in greater numbers. Bacteria get out of hand when they encounter the perfect conditions: a protected location that is warm and moist with a supply of delicious food.
Giulia Enders Gut: The Inside Story of Our Body__ Most Underrated Organ
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The aim of cleaning, then, should be to reduce bacteria numbers__ut not to zero. Even harmful bacteria can be good for us when the immune system uses them for training. A couple of thousand Salmonella bacteria in the kitchen sink are a chance for our immune system to do a little sightseeing. They become dangerous only when they turn up in greater numbers. Bacteria get out of hand when they encounter the perfect conditions: a protected location that is warm and moist with a supply of delicious food.
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Giulia Enders

Gut: The Inside Story of Our Body__ Most Underrated Organ

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