营养不良或免疫功能低下儿童的生命最易受到腹泻威胁。
Children who are malnourished or have impaired immunity are most at risk of life-threatening diarrhoea.
通常，流感波及的对象是老年人和免疫功能低下的人群。
Flu typically preys on the old and on those whose immune systems are compromised.
结论被动吸烟可增加儿童呼吸系统发病和非特异免疫功能低下。
Conclusions Passive smoking could promote the prevalence of respiratory diseases and deteriate the non-specific immune function.
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