Why do some sources advise waiting longer than 6 weeks for HIV testing?

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Why do some sources advise waiting longer than 6 weeks for HIV testing?
Most people will test accurately for HIV after 6 weeks have passed since their last risk. In some cases where a person has a highly compromised immune system, such as those in which a person has recently undergone chemotherapy or an organ transplant, it may take 3-6 months for their body to develop enough antibodies to test positive.
These are very extreme situations, however, and other more common conditions such as colds or the flu, diabetes, asthma, and many others, will not affect the body's development of HIV antibodies in that way. Those who suggest window periods longer than 6 weeks are trying to account for all those who may also have compromised immune systems. The CDC (Centers for Disease Control and Prevention) recommends waiting 3 months for a conclusive test result.
大多数人在高危6周后能准确的测到hiv抗体，例如一些人最近经历chemotherapy，或者器官移植，这将会需要3~6个月才能产生足够的抗体。这些是极其特殊的情况。然而，在其他一些一般的情况下，比如感冒，糖尿病，哮喘等等等等，都不会影响hiv抗体的产生。这些要求超过6周检测的是为了发现具有免疫缺陷的感染个体。CDC推荐检测3个月以得到一个最终的结果。http://www.aac.org/site/PageServer?pagename=basics_home#window

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