*Treponema pallidum* s a gram-negative bacteria that has lipoproteins can activate the host immune response. This can cause damage to host tissues and allow the pathogen to evade the host immune system and spread. 

Virulence factors of *Treponema pallidum*

In order to diagnose syphilis infections, it is important to know the three stages of syphilis infection: 
- Primary syphilis
- Secondary syphilis
- Tertiary syphilis

Stages of Syphilis Infection

- nontreponemal serologic test
- treponemal serologic test
- Silver stain microscopy

Diagnostic tests for syphilis

*Treponema pallidum*, the causative agent of syphilis, is a flexible, spiral cell (spirochete). It can be extremely thin, with a width of $${}<0.15$$ μm, and matches the refractive index of the surrounding medium, which makes it very difficult to view using standard brightfield microscopy.

*Treponema pallidum* Morphology

*Treponema pallidum* is a gram-negative bacteria that causes the disease syphilis. 

University of Wisconsin - Madison

Syphilis is a sexually transmitted disease that is known to cause skin lesions but can progress to be a deadly disease.

Syphilis

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

*Treponema pallidum*

Congenital syphilis can be transmitted to a child during. This infection can cause stillbirths. Children born with congenital syphilis can develop mucous patches and have damage to organs and teeth. It can also lead to other issues like blindness and deformities. Pregnant women are often tested in the first trimester for syphilis because of how serious these infections are for the child.

Congenital syphilis

By 1947, penicillin was established as a safe and effective cure for syphilis. The existence of this treatment became a critical ethical benchmark, making the deliberate withholding of it from patients or research subjects a major violation of medical and research ethics.

Penicillin as a Treatment for Syphilis

Based on the patient's history and current symptoms, what is the most likely diagnosis for this sexually transmitted infection? Justify your answer by explaining the significance of the two distinct phases of symptoms described.

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