Another group of people who may need to take extra precautions are those who are immunocompromised, meaning their defenses against infection are lower than usual. "In a person who is at risk for infections — usually someone recently hospitalized — attention to good household cleaning can be important," said Garey.

免疫功能不全的人们也需要格外防范，他们抵抗感染的能力比普通人要低。加里说：“对于可能被传染（一般最近住过院）的人来说，注意室内卫生很重要。”

immunocompromised: adj. [ɪmjʊnoʊ'kəmprəmɪst] 免疫系统受损伤[削弱]的

In summary, if you're at risk of infection, or you have a small child, "it would be a good idea to take your outdoor shoes off when you enter your home," Garey told Live Science. "For most healthy persons, however, you can make the decision as much based on preference and habit, as potential health concern."

总而言之，加里告诉趣味科学网站说，如果你有感染的风险，或者你有年幼的小孩，“那么你在进屋时最好把鞋子脱掉，不过对大多数健康人来说，你可以根据潜在的健康考量来做决定，也完全可以按照个人喜好和习惯”。

And it's worth remembering that bacteria exist elsewhere than on our shoes: They're in the air, on our skin, in our hair and inside our very guts. In fact, we live in a constantly swirling bacterial soup that would be impossible to completely disinfect.

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