Another theory is that parasitic worms in our guts can produce compounds that suppress the immune system.

还有另一种推测是，人体肠内的寄生虫可以产生抑制免疫系统的化合物。

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One theory is that, over millennia of evolution, our immune systems got used to worms. So if you take them away, the immune system runs wild, as it has nothing to work against.

有推测说，经过几千年的进化，我们身体的免疫系统已经习惯了蠕虫的存在，所以如果去除它们，免疫系统就会因没有对抗物而失控。

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In theory, an over-stimulated immune system could aggravate allergies or autoimmunity.

理论上讲，机体的免疫系统不应过分受到刺激，否则其敏感症和免疫力将恶化。

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AN-1792 trained the patient's own immune system to attack the plaques, in theory preventing or even reversing the progression of the disease and the dementia that comes with it.

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Seeing the innocuous virus, the immune system creates attack cells that should, in theory, fight off HIV.

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In theory, the medicines could affect the immune system, because a receptor on immune cells is very similar to DPP-4.

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