One of the most distressing things about this whole picture: Chlamydia is very common, Chlamydia causes pelvic inflammatory disease, and in fact, in 75 % of women, Chlamydia is asymptomatic. So unfortunately, you can’t just rely on symptomotology to bring a patient to treatment and screening to prevent the complication of PID and the subsequent complications of infertility, etc. Men are a little bit more likely to have symptoms, though 40 to 50 % of them are asymptomatic.