Quick Answer
Chlamydia is the most common reportable bacterial STI in the U.S., with ~1.6 million cases reported annually. It is curable with a 7-day course of doxycycline, but ~70% of women and ~50% of men have no symptoms, allowing it to silently damage reproductive organs.
- ~1.6 million reported cases (CDC, 2023)
- Bacterial and curable
- Treatment: 7-day doxycycline
- Most infections are asymptomatic
Context Most Pages Skip
Chlamydia is the most common reportable bacterial STI in the U.S. — and the one most likely to be silent.
Key Facts
Most people never notice symptoms, which is why screening matters. The CDC recommends annual chlamydia screening for all sexually active women under 25.
⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.
Sources & Further Reading
- CDC — Sexually Transmitted Infections
- CDC STI Treatment Guidelines
- WHO — Sexually transmitted infections fact sheet
- MedlinePlus — Sexually Transmitted Diseases
Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.