*Clostridium tetani* causes the disease tetanus. *C. tetani* makes a neurotoxin that can interact with the neurons in the central nervous system and inhibit nerves causing paralysis. This benefits the survival of the pathogen but is life threatening for the host. 

Parasitism of *Clostridium tetani* as a human pathogen

Although less than 1% of prokaryotic species are human pathogens, they cause a substantial number of human diseases by invading the body, producing toxins, or causing infections. This host-pathogen interaction represents a parasitic relationship, giving rise to diseases such as tetanus, diphtheria, pertussis, tuberculosis, and leprosy.

Prokaryotes as Human Pathogens

Parasitism is a type of symbiosis where one organism or population benefits and the other is harmed.

University of Wisconsin - Madison

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- Mutualism 
- Amensalism 
- Commensalism
- Neutralism 
- Parasitism

Types of Symbioses Among Prokaryotes

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

Parasitism 

Mutualism, also known as syntropy or crossfeeding, is a symbiotic relationship in which two different species interact and both species obtain a benefit.

Mutualism 

Amensalism is a type of symbiotic relationship where one population or species is harmed or destroyed, while the other population remains unaffected.

Amensalism 

Commensalism is a type of symbiotic relationship in which one organism benefits from the interaction while the other organism is unaffected.

Commensalism 

Neutralism is a type of symbiosis in which two coexisting organisms interact, but neither is affected in any way.

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