For the first five months of this year, there have been 98 cases of chlamydia reported in Franklin County and 12 cases of gonorrhea, according to the Missouri Department of Health and Senior Services.

“We see quite a few chlamydia cases in Franklin County,” said Angie Hittson, director of the Franklin County Health Department.

The county health department tests for chlamydia, gonorrhea, syphilis and HIV. All of those sexually transmitted diseases are reportable, meaning that physicians and labs are required to report them to the county health department for tracking purposes.

The health department treats chlamydia but not the other STDs. The health department can also provide education and condoms.

There is a urine test for gonorrhea and chlamydia, and a blood test for HIV and syphilis.

Below is a breakdown of the number of STDs in Franklin County for other years:

2013, chlamydia, 289, gonorrhea, 31, syphilis, two; 2012, chlamydia, 256, gonorrhea, 11, syphilis, one; 2011, chlamydia, 251, gonorrhea, 21, syphilis, one; and 2010, chlamydia 160, gonorrhea, 29, syphilis, three.

There have been 49 reported cases of HIV, which is the virus that causes AIDS, in Franklin County between 1982 and 2013, according to the state health department. That excludes people diagnosed in Missouri correctional facilities.

Last year, there were 35,483 cases of chlamydia, gonorrhea and syphilis in Missouri.

Chlamydia is the most commonly reported STD in the United States, according to the Centers for Disease Control and Prevention.

The CDC website also states that sexually active females 25 years old and younger need testing every year; and although it is easy to cure, chlamydia can make it difficult for a woman to get pregnant if left untreated.

In 2012, 1.4 million cases of chlamydia, or about 457 cases per 100,000 people, were reported in the country, according to the CDC.

Likewise, nationally in 2012 there were 334,826 gonorrhea cases reported in 2012, or about 108 cases per 100,000 people. That is about a 4 percent increase nationally in gonorrhea while chlamydia was stable with the prior year, the CDC states.