What STI can go undetected?

[girlsontv]

Strange question this, I'm writing a script for a Uni film, and was wondering if there are any Sexually Transmitted Infections that can go undetected and still passed onto new partners? When I say undetected, I mean that it may not be picked up in a standard STI check?
Thanks in Advance
xxx

[Velvetee]

I think all STIs are detectable when tested for, although some maybe classified as non specific.

There are diseases where the person who has it, may not realise and therefore, have no reason to get tested. Diseases like Chlamydia often do not show any symptoms.

[jellybaby09]

Standard STI checks tend to consist of tests for Clamidya (sp?), gonnoreah (sp?), trich and another i have forgotton! Also available is an optional blood test for HIV and Syphillis. Genital Herpes is one of the STI's that is incredibily common, yet it is not tested for at routine exam. Detection is by visible examination and PCR swab from active sores. Swabs can only be taken from active sores and sometimes will still be negative if sores are a few days old.
For more information on testing, facts andfigures go to the HVA website www.hva.org.uk
Good luck with the film, it would great to add herpes to the script as there is a lack of awareness and so much stigma attached to this but yet it is so common!

[jellybaby09]

I forgot to mention... 90% of people infected with H do not know that they have it and either do not have symptoms or mistake it for minor irritations (itching etc). Also, there is assymptomatic shedding which is invisible and the virus can be passed on during this time unknowingly. Therefore, the virus can be passed whilst no symptoms are present!