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Scientists studying why pets appear to protect kids against asthma and allergies say the answer might lie in the world of bacteria that live in the gut. 科学家们研究了养宠物为何似乎能保护孩子不会患上哮喘与过敏，他们说，答案可能在于肠道内生活的菌群。 A new study published Monday found that exposing mice to dust from households where dogs were allowed outdoors significantly changed the composition of gut microbes in the mice. 周一公布的新研究发现，将老鼠暴露于准许狗外出的家庭产生的灰尘中，极大地改变了老鼠肠道菌群的成分。 When the mice were then challenged with some well-known allergy triggers, they had significantly reduced allergic responses compared with mice that had been exposed to dust from homes without dogs or that weren't exposed to any dust. 随后这些老鼠被注射了一些有名的过敏触发物，相比那些暴露于无狗家庭灰尘或是未暴露于灰尘中的老鼠，这些老鼠的过敏反应大大减小。 | 
