Final answer:
Chlamydia is a common bacterial STD caused by Chlamydia trachomatis. It can be transmitted through sexual contact and often has no symptoms, so regular testing is important.
Step-by-step explanation:
One common bacterial sexually transmitted disease (STD) is Chlamydia. Chlamydia is the most common bacterial STD in the United States and is caused by the bacterium Chlamydia trachomatis. It can be transmitted through sexual contact and can cause symptoms like discharge, pain during urination, and pelvic pain. However, many people with Chlamydia have no symptoms, so it's important to get tested regularly if you are sexually active.