Quick Answer
STI stands for sexually transmitted infection, the preferred modern term for what used to be called STDs or VD. 'Infection' is more accurate than 'disease' because most people with STIs have no symptoms.
- STI = infection present, regardless of symptoms.
- STD = disease (symptoms or complications) has developed.
- CDC and WHO now use STI as the preferred term.
- The shift reduces stigma and improves accuracy.
Context Most Pages Skip
The term STI is more accurate and less stigmatizing than STD.
⚕️ 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.