研究报告的作者认为二手烟可能影响免疫系统。这使得出生不久的婴儿、刚学会走路的婴儿及低龄儿童更容易受各类传染病的影响。

The study authors speculate that secondhand smoke may affect the immune system, making infants, toddlers and young children more susceptible to infections of all kinds.

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对于婴儿，儿童及免疫力低下的人群，传染给别人的可能性甚至更久。

Infants, young children and immunocompromised people may be infectious for even longer.

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目的了解深圳地区人类免疫缺陷病毒1型（HIV-1）毒株亚型及流行情况，分析其传染来源和传播规律。

Objective To study the epidemic status of human immunodeficiency virus type 1(HIV-1)subtypes in Shenzhen and to study their transmission source and routes.

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