Final answer:
Chlamydia is the most common bacterial STD in the United States, with 2.9 million cases estimated in 2015. It is caused by the bacterium Chlamydia trachomatis and is prevalent among young people.
Step-by-step explanation:
Chlamydia is the most commonly occurring bacterial STD in the United States.
It is caused by the bacterium Chlamydia trachomatis and is highly prevalent among young people, especially females.
In 2015 alone, there were an estimated 2.9 million cases of chlamydia in the United States.
Chlamydia can be transmitted through sexual contact, and it is important for individuals to get tested and treated if necessary.