<qa>  What is the rate of referral by patients?Patients diagnosed with chlamydial infections a sexually transmitted disease are asked to notify their sex partners and tell them to seek medical evaluation: patient referral. Rates of actual referral by patients are unknown, but estimates derived from several evaluations suggest somewhere between 30 - 55 of partners are notified and tested for chlamydia. Current prevalence and yearly rates of infection suggest this level of partner notification and treatment is insufficient to control the disease. 