Narrator: This is Science Today. Approximately four out of ten teenagers will have a sexually transmitted disease during their adolescence. Just as disturbing is the fact many of them will not even know it. Mary Ann Shafer, a teen health specialist at the University of California, San Francisco says chlamydia, which is most common in teenage girls, is often a silent infection.
Shafer: So there's no indication you'd have it unless you came in and got checked. And yet, even without any symptoms at all it may cause an infection so you might have problems later on with getting pregnant or even having a tubal or ectopic pregnancy that can be devastating - without you even knowing it.
Narrator: Shafer says a new urine test may lead to easier, early detection since it's cost-effective and perhaps more important to teens, non-invasive.
Shafer: Half the kids who are having sex never even come in to see a doctor. We think perhaps we'll get that other half of the young women and now get some more men in to be tested that normally would never come in for testing because they don't come in or they're afraid to get tested >cause it hurts.
Narrator: For Science Today, I'm Larissa Branin.