Unlike in syphilis, chancroid is associated with soft chancres that are localized on the genitals or mouth and anus. Soft chancres are painful, open sores that can produce fluid or bleed. 

University of Wisconsin - Madison

*Haemophilus ducreyi* is a gram-negative bacteria that causes the sexually transmitted infection, chancroid. 

*Haemophilus ducreyi*

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

Signs and Symptoms of Chancroid

*Haemophilus ducreyi* has many different virulence factors like lipooligosaccharides, protective outer membrane proteins, antiphagocytic proteins, secretory proteins, and collagen-specific adhesin NcaA. 

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