STD rates in the state have been going up, and had the highest gonorrhea rate in the country in 2016. Health officials say there are many reasons for this, including lack of funding for clinics, which has caused many to close or to charge fees, and insufficient sex education for youth (Gulfport has abstinence-only sex ed). Half of the positive STD results were for people between 15 and 25 years of age.
In 2017, there were 1,208 chlamydia cases in Harrison County, at a rate of 589.2 per 100K people.
The gonorrhea rate was 313.6, which is really high. The primary and secondary syphilis rate was 18. 20 people were diagnosed with HIV in Harrison County that year, for a rate of 9.8.
There are a few STD-testing clinics in Gulfport, and more in Biloxi as well. You may qualify for free STD testing at the city clinics, but they might not test for all STDs.
Also, public clinics tend to have long waits, increasing the chances someone might see you there. Immediate Family Clinic provides STD testing, and they are located on Pass Rd in Biloxi.