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。

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Low 'herd immunity'.

“群体免疫性”低。

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Chronic patients should also be according to the illness rest appropriately, prevent excessive fatigue, low immunity and cause infection again.

慢性患者亦应根据病情适当地休息，防止过度疲劳后，机体免疫力低下而造成再感染。

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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