Thanks for the query to askthedoctor.com
It is to be understood that Urethra alone is not the site of infection by chlamydia in men or women. The prevalence of infection is varied by anatomic sites,- Chlamydia :- rectal, 7.9%; urethral, 5.2%; and pharyngeal, 1.4%; for Gonorrhea:- rectal, 6.9%; urethral, 6.0%; and pharyngeal, 9.2%.
Approximately 85% of rectal infections are found to be asymptomatic in various studies conducted which support the need for routine screening. Because 53% of chlamydial infections and 64% of gonococcal infections are at nonurethral sites, these infections would be missed and not treated if only urethral screening was performed. In addition,>70% of chlamydial infections would be missed and not treated if MSM( men who have sex with men) were tested only for gonorrhea.
So, pertaining to your question , urethra is not the only site where these STIs can harbor themselves and screening has to resorted to a complete bodily screening depending on symptoms and signs produced by different locales ( rectal, urethra or pharyngeal).
I hope i have answered your query in detail,
wishing you safe sexual practices and good health in future,
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