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After the SARS epidemic in Hong Kong, the city is getting more and more hygienic, however, Diumanpark wondered if being too clean would reduce body resistance to virus and bacteria [zh].
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There is now lots of evidence that exposing children to dirt, plants, and animals reduces the incidence of asthma and allergies. Disinfectants and germicides can also harm the immune system by killing the good microbes we need to stay healthy. Soap and water is all you need to keep a clean home.