Flu typically preys on the old and on those whose immune systems are compromised.

通常，流感波及的对象是老年人和免疫功能低下的人群。

youdao

Babies and people with compromised immune systems would be most at risk.

婴儿及免疫系统稍弱的人群将处于极度危险之中。

youdao

Risky-food consumption also appeared to be higher among children with compromised immune systems than among healthy children.

“危险”食物消费在免疫功能较弱的儿童群体食用比例要高于在健康儿童群体。

youdao

So now - so you have HIV and then because their immune system is compromised that MRSA has the ability to take hold in the person with HIV more - it's more likely that the MRSA will take hold in the person with HIV than a non-HIV person, right?

NPR: Tracking a New Strain of Drug-Resistant Staph

Mold can be deadly--if you eat enough of it or if your immune system is compromised.

FORBES: Science Versus Hysteria