*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

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

University of Wisconsin - Madison

- 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

Mutualism is when two species benefit from living in the same community.

Mutualism 

Amensalism is a type of symbiosis where one population is harmed but another population is unaffected. 

Amensalism 

Commensalism is a type of symbiosis when one organism benefits while the other is not affected.

Commensalism 

Neutralism refers to when both organisms or populations are not positively or negatively affected by each other.

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