According to the United States Centers for Disease Control and Prevention (CDC), presented at the National Conference on the Prevention of Sexually Transmitted Infectious Diseases (STIs) in March 2012 in Minneapolis, Minnesota, United States, no screening for chlamydia not all categories of patients listed in national guidelines are available.

According to data from the United States Centers for Disease Control and Prevention's STI Prevention Department, of the 23 million American women aged 15 to 25, 68% are sexually active and only 38% of patients have been tested for chlamydia infection.

The highest probability of examination was observed in women with 2 or more sexual partners, representatives of the black race, patients with inflammatory diseases of the pelvic organs or women who underwent a pregnancy test in the 12 months precedents.

Urogenital chlamydial infection is the most common infectious disease in the United States. Thus, in 2010, 1.3 million cases were diagnosed, but according to the CDC, the real number of cases is at least 2 times higher - it is estimated that 2.8 million new cases of urogenital chlamydia infection occur in the United States each year..

The CDC recommends a routine annual C. trachomatis exam for all sexually active women under the age of 25, as well as a re-exam in any patient who has ever been diagnosed or treated with chlamydia. In addition, women and men with chlamydia infections should be re-examined approximately 3 months after treatment for the initial episode of infection, regardless of their belief in the adequacy of treatment for their sexual partner.

The frequency of re-examinations remains low, and many cases of C. trachomatis reinfection remain undiagnosed. Thus, according to data from Dr. Kelly Morrison Opdyke and colleagues, who analyzed data from more than 60,000 men and women who were diagnosed with urogenital chlamydia infection from 2007 to 2009, only 11% of men and 21 % of women were seen repeatedly in 30-180 days. Among those re-examined, the frequency of redetection of C. trachomatis was 25% in men and 16% in women.

According to the researchers, it is important not only to examine sexually active women every year, but also to re-examine all patients who have already been diagnosed with chlamydia infection. Chlamydia infection can be treated quite easily with antibiotics, and re-examination is important to prevent serious future health consequences.