Even if the link between the virus and obesity is proven, weight gain remains a complex issue that involves a person's genetics, culture, and environment, not just his or her history of infection.

即使能够证明病毒和肥胖存在联系，体重的增加仍然是一个涉及到人类基因、文化和环境因素的复杂问题而不仅仅只与他的病毒感染史有关。

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HIV infection of the CNS results in a progressive subcortical dementia, the AIDS dementia complex.

中枢神经系统HIV感染导致一个进行性皮质下痴呆、艾滋病痴呆复合征。

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These cysts showed particular low density and long T1 and long T2 abnormal signal intensity, but these cysts should become complex when accompanied by infection, operation or puncture.

以低密度和长t 1、长t 2信号为主，合并感染、手术或穿刺可使病变密度或信号变得复杂。

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But experts said the relationship between bed occupancy and infection was more complex than some assumed.

BBC: NEWS | Health | Bug blunders 'known for months'

New biologic meshes including some made from pig skin are being used in complex repairs because they can reduce the chance of infection, but they are more expensive.

WSJ: A Secret for Patients Undergoing Hernia Repair

Although research has highlighted the importance of zinc for the immune system, because the mineral has many complex roles in the body it is not understood in any detail how it helps fight off infection.

BBC: Zinc 'keeps immune system in check'