Quick Answer
Yes. Syphilis is caused by Treponema pallidum, a spiral-shaped bacterium classified as a spirochete. Spirochetes are a group of thin, corkscrew-shaped bacteria that move by twisting and flexing rather than by using external tails. Treponema pallidum is the specific spirochete responsible for syphilis, and no other organism causes the disease.
- Treponema pallidum is the only organism that causes syphilis
- Spirochetes are spiral bacteria that move by bending and coiling
- Syphilis spreads mainly through direct contact with an infectious sore or rash
- The infection moves through primary, secondary, latent, and tertiary stages
- Injected benzathine penicillin is the recommended treatment at every stage
- Treponema pallidum is too thin to be seen on routine light microscopy
Context Most Pages Skip
Spirochete describes a shape and a way of moving, not a disease. Treponema pallidum belongs to a group of bacteria called spirochetes - long, thin cells coiled into a helix that push themselves forward by bending and rotating instead of by lashing external tails. That body plan matters clinically. Treponema pallidum is too slender to show up on a routine light microscope, and it does not grow on standard culture media, so diagnosis depends on antibody blood tests and direct detection rather than a simple culture. Its outer membrane also carries very few surface proteins, which helps it escape immune clearance and helps explain why the infection can stay silent for years.
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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.