Final answer:
Chlamydia is the most frequently reported bacterial STI in the United States, especially prevalent among young people aged 15-24, and can be cured with antibiotics but may lead to re-infection if precautions are not taken.
Step-by-step explanation:
The most frequently reported bacterial sexually transmitted infection (STI) in the United States is chlamydia. This infection is caused by the bacterium Chlamydia trachomatis. Chlamydia is particularly prevalent among young people, with around two-thirds of new cases being diagnosed in individuals between the ages of 15 and 24. It has been reported that there were an estimated 2.9 million chlamydia infections in the United States in 2015 alone. This STI can be transmitted through sexual contact with various mucous membranes and does not necessarily require the ejaculation of semen to spread. While it can be cured with antibiotics, if left untreated, it can cause complications, and individuals who have been treated for chlamydia can become re-infected if exposed again.