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Updated: Jun 19, 2026

Procedures for In Vitro Cultivation of Treponema pallidum, the Syphilis Spirochete
09:45

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MORPHOLOGICAL AND PATHOGENIC VARIATIONS IN TREPONEMA PALLIDUM.

H Noguchi1

  • 1Laboratories of The Rockefeller Institute for Medical Research, New York.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary

Distinct Treponema pallidum (syphilis bacterium) varieties, including thicker and thinner forms, were identified. These morphological differences correlate with distinct lesion types in rabbits, potentially explaining human syphilis clinical variations.

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Area of Science:

  • Microbiology
  • Pathology
  • Infectious Diseases

Background:

  • Treponema pallidum is the causative agent of syphilis.
  • Understanding morphological variations within T. pallidum is crucial for disease characterization.

Purpose of the Study:

  • To investigate and classify morphological differences among Treponema pallidum cultures.
  • To determine if these morphological variations correlate with pathogenic differences.
  • To explore the potential for these variations to explain clinical features of human syphilis.

Main Methods:

  • Comparison of multiple Treponema pallidum cultures from rabbit testicular lesions and human syphilis cases.
  • Morphological characterization, dividing specimens into thicker, thinner, and average types.
  • Inoculation of rabbit testicles to observe lesion development (diffuse vs. nodular orchitis).
  • Separation and culturing of distinct varieties found in mixed infections.

Main Results:

  • Definite morphological differences were observed, classifying T. pallidum into thicker, thinner, and average forms.
  • These varieties, though culturally similar, induced distinct lesion types (diffuse or nodular orchitis) in rabbits.
  • The thinner variety, while morphologically similar to Treponema microdentium, was distinguished by cultural characteristics.

Conclusions:

  • Morphological variations in Treponema pallidum cultures represent distinct varieties.
  • These varieties exhibit differential pathogenicity, as evidenced by distinct orchitis types in rabbits.
  • Such variations may represent 'racial' differences within the species and could illuminate clinical syphilis manifestations.