Final answer:
Chlamydia is the most common bacterial sexually transmitted infection (STI) in the United States.
Step-by-step explanation:
Chlamydia is the most common bacterial sexually transmitted infection (STI) in the United States. It is caused by the bacterium Chlamydia trachomatis. Chlamydia is most prevalent among young people, with about two-thirds of new cases occurring in individuals between the ages of 15 and 24. It can be transmitted through sexual contact with an infected partner and can result in serious health complications if left untreated.