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CRANE (CBSDFW.COM/AP) — An outbreak of chlamydia, a sexually transmitted disease, has been reported at a small West Texas high school.

The Crane Independent School District sent a letter to parents of Crane High School students informing them that 20 cases of chlamydia had been confirmed at the school. The school has an enrollment of about 300 students.

But the spike in transmitted diseases is not isolated to the Crane Independent School District. According to the Dallas County Health and Human Services, in 2013,  numbers of primary and secondary syphilis diagnoses in Dallas County increased by 31% from 2012. In El Paso, a report done by the Robert Wood Johnson Foundation and the Wisconsin Population Health Institute shows that there are 600 new cases of chlamydia for every 100,000 people. Earlier this year, the Center for Disease Control and Prevention reported that 8 of the 11 states with the highest rates of chlamydia, gonorrhea, and syphilis were in the South.

State health officials had notified the district of a significant number of chlamydia cases reported in Crane County and adjacent Upton County. Crane District officials plan meet with the school’s advisory committee of teachers, parents and school officials to discuss the situation Monday.

Chlamydia is curable, but if left untreated can cause permanent damage to women’s reproductive systems.

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