Small amounts of reagents and a fluid sample from a patient are guided through its tiny channels to test for STDs.

少量的试剂和流体样本病人被引导穿过它的细小通道测试性传播疾病。

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Unfortunately, not only are most STDs asymptomatic, you can't count on staying safe just by going for regular doctors visits.

不幸的是，不光很多STD没有明显症状，你也不能指望定期去医院检查就可以高枕无忧。

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You can't always tell if someone is infected, however, because many STDs cause no symptoms, at least at first.

通常无法识别感染者，因为许多性传播疾病没有症状，至少在初期是没有症状的。

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While the link to prostate cancer may sound surprising, there are other cancers caused by STDs.

CNN: Prostate cancer linked to sexually transmitted disease

But Labour's Chris Bryant described Ms Dorries' bill as "the daftest piece of legislation" he had seen, saying there was no evidence teaching abstinence would lead to fewer pregnancies or STDs.

BBC: Nadine Dorries: Schools should teach sexual abstinence

If you look at a population and say, OK, here are people who have a high proportion of unaccompanied men, very high stress levels because of the immigration experience, some - there's some evidence of untreated STDs being fairly high.

NPR: HIV Concerns for Many Mississippi Latinos