An outbreak of the sexually transmitted infection, chlamydia, at a Crane, Texas school has prompted the school district to send a letter to parents recently to notify them of the situation.

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Texas map

According to local media reports, the Crane Independent School District said that 20 chlamydia cases have been confirmed in Crane High School students. The school has a student population of 300.

Chlamydia is the most common bacterial sexually transmitted infection in the United States. In 2013, a total of 1,401,906 chlamydial infections were reported to CDC in 50 states and the District of Columbia. This case count corresponds to a rate of 446.6 cases per 100,000 population.

Chlamydia is most common among young people. Chlamydia prevalence among sexually-active young persons aged 14-24 years is nearly three times the prevalence among persons aged 25-39 years. It is estimated that 1 in 15 sexually active females aged 14-19 years has chlamydia.

People get chlamydia by having sex with someone who has the infection. “Having sex” means anal, vaginal, or oral sex.

Chlamydial infections in women are usually asymptomatic. However, untreated infection can result in pelvic inflammatory disease (PID), which is a major cause of infertility, ectopic pregnancy, and chronic pelvic pain.

Men who are symptomatic typically have urethritis, with a mucoid or watery urethral discharge and dysuria. A minority of infected men develop epididymitis (with or without symptomatic urethritis), presenting with unilateral testicular pain, tenderness, and swelling.