Gary Sherman and his colleagues have published research showing how prudish disgust-sensitivity is associated with a superior ability to detect impurities.
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Science News
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Scoop.it!
What disgusts humans is proving irresistible to researchers exploring the evolutionary value of revulsion. 
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Scoop.it!
Ask any person, from any country‚ to make a fearful face and you'll get the same response-eyebrows raised, eyes wide open, flared nostrils. A disgusted face, on the other hand, shows brows furrowed, eyes narrowed, and a tight mouth. The universal nature of certain facial expressions like fear, disgust, and sadness has led evolutionary scientists to wonder if facial expressions play a more fundamental biological role than just conveying emotion.
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"Disgust not only makes people want to avoid impurities but also makes people better able to see them"