Low 'herd immunity'.

“群体免疫性”低。

youdao

On the other hand, even if males have a strong immune system that clears infection, they will become reinfected rapidly, so the effective benefit of immunity is low.

另一方面，即使男性拥有一个更加强健的免疫系统，能够消除感染，他们也会快速地被再次感染，所以免疫系统的有效效益很低。

youdao

Objective To investigate the effect of patient controlled epidural analgesia (PCEA)using low concentration bupivacaine and morphine on immunity function of the carcinoma patient after surgery.

目的探讨病人自控硬膜外低浓度布比卡因复合小剂量吗啡镇痛对肿瘤病人术后免疫功能的影响。

youdao

The current recommendation is based on unique conditions associated with the existing pandemic, including low levels of population immunity to 2009 H1N1, the potential for health-care personnel to be exposed to H1N1 patients, and other factors, Dimond says.

CNN: STORY HIGHLIGHTS

Immunity to dengue is low in Singapore's population because of the intensive dengue-carrier controls, "making the population vulnerable to outbreaks, " said Ng Lee Ching, director of the Environmental Health Institute at Singapore's National Environment Agency.

WSJ: Dengue Fever on the Rise in Singapore