Normally, the immune response tightly controls the local inflammatory process to eradicate invading gram-negative bacteria .

正常情况下，免疫反应精细地调控局部炎症反应。

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When a Kell positive man impregnates a Kell negative woman, there is a 50 percent chance of provoking an immune response in the woman's body that attacks her developing fetus.

一旦非kell血型女性怀有Kell血型男性的身孕，母体中将有50%的几率产生抗体，攻击发育中的胎儿。

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And the tests used to diagnosis hepatitis and HIV are based on the body's immune system response to infection, so some results could have come back negative prematurely.

CNN: Dozens of Okla. dentist's patients positive for hepatitis