但是55岁后肠道，尤其在大肠中的益生菌含量明显下降，免疫学教授Tom MacDonald介绍说。

But levels of friendly bacteria in the gut drop significantly after 55, particularly in the large intestine, says Tom MacDonald, professor of immunology at BartsAnd the London medical school.

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黏膜免疫是当前免疫学领域的研究热点，尤其是肠道黏膜免疫越来越被人们重视。

Mucosal immunization is one of the most important immune routines in immunology, especially gut mucosal immunization.

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