Immunity is developed over years of exposure, and while it never gives complete protection, it does reduce the risk that malaria infection will cause severe disease.

多年接触会形成一定程度的免疫力，虽然这并不能完全防护，但确实会降低感染疟疾后出现重症的风险。

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Recovery from infection by one provides lifelong immunity against that virus but confers only partial and transient protection against subsequent infection by the other three viruses.

感染一种病毒并恢复后，对该病毒具有终生免疫，但对此后感染的其他三种病毒只有部分和短暂免疫力。

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HSP70 plays a critical biological role in cells' stress protection, heat endurance, apoptosis, inflammation, and immunity reaction.

HSP70在细胞应激保护、热耐受、凋亡、炎症与免疫反应中均发挥其重要的生物学效应。

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But the current swine flu is a new strain to which humans have no immunity and against which existing vaccines offer no protection.

VOA: standard.2009.04.30

Predictably, the Miccosukee Tribe claimed protection under sovereign immunity.

FORBES: IRS Wins Fight With Native American Tribe

Ms. Diallo's attorneys disputed that Mr. Strauss-Kahn enjoyed such immunity and argued he hadn't invoked the protection while facing criminal charges.

WSJ: Strauss-Kahn Seeks Dismissal of Civil Suit

Breast-feeding can certainly help provide immune protection against multiple illnesses, but not if a mother does not have immunity to a certain disease such as pertussis.

CNN: Can breast-feeding prevent whooping cough?