But knowing how much natural immunity has been acquired through infection is more difficult, especially given the very mild nature of illness in the vast majority of patients.

但很难说清因感染获得了何种程度的天然免疫力，尤其是因为在绝大多数患者身上，疾病的性质非常温和。

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Some of the Europeans and Asians then went back to Africa around 10, 000 years ago, bringing the newly acquired genes and their associated immunity boost with them.

之后，一些欧洲人和亚洲人在大约10000年前左右回到了非洲，同时携带了新获得的基因以及强化了的免疫能力。

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The first suckle is as important to refuel its very meagre energy reserves as to provide acquired immunity.

而第一口母乳对于弥补仔猪非常微量的能力储备，为仔猪提供获得性免疫非常重要。

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He discovered that infants given doses of an anti-malarial drug called Fansidar along with their regular childhood vaccinations often acquired immunity to malaria.

ECONOMIST: Malaria research gets a shot in the arm

Innate immunity is the defence against infection that babies are born with, as opposed to adaptive immunity which is acquired as people develop antibodies through their exposure to disease-causing agents.

ECONOMIST: Genetics and infectious disease: The germ of an idea | The