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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Scientists probably haven't stumbled on that drug yet, but a drug called rapamycin, already used to suppress the immune systems of organ transplant recipients, comes close.

科学家们可能还没发现那种不老药，但一种叫雷帕霉素的药物，已用来抑制器官移植受体的免疫系统，很接近。

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Therapies that suppress the immune system carry the risk of letting infections and even tumors go unchecked.

抑制免疫系统的疗法会导致患者受到感染的威胁甚至出现无法抑制的肿瘤。

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Newer drugs attempt to suppress only one small part of the immune system, not all of it.

VOA: special.2009.04.14

Some drugs can be a problem because they suppress the immune system.

VOA: special.2009.04.14

"The best way to either eliminate the virus or allow the immune system to suppress residual virus is to treat someone as early as possible after infection so as not to allow a substantial reservoir of the virus to take hold, " Fauci told CNN.

CNN: Researchers: Toddler cured of HIV

The hormones suppress the immune system and also produce natural steroids to help support the baby.

BBC: Pregnancy - the 'miracle' cure?

The weird part:In cancer no drug should suppress the immune system, so Ariad's approach seemed inadvisable.

FORBES: Mission Improbable