The bacterium *Clostridium perfringens* is a common cause of food poisoning in the United States and the causative agent of gas gangrene. When its endospores enter a wound and germinate into viable cells, they produce a toxin that can cause tissue necrosis.

*Clostridium perfringens*

The bacterium *Clostridium tetani* is the causative agent of tetanus. It produces a neurotoxin that enters neurons and travels to the central nervous system, where it blocks the inhibition of nerve impulses responsible for muscle contractions, leading to spastic paralysis.

*Clostridium tetani*

The bacterium *Clostridium botulinum* produces botulinum neurotoxin, the most lethal biological toxin known, which blocks acetylcholine release in neuromuscular junctions to cause flaccid paralysis. While responsible for rare, often fatal cases of botulism, this toxin is also used in minute doses to treat human muscle pathologies and cosmetically to reduce wrinkles.

*Clostridium botulinum*

The bacterial genus *Clostridium* consists of rod-shaped, typically obligate anaerobes that produce resilient endospores, enabling them to survive for many years in anaerobic environments like soil and aquatic sediments. This genus is notable for producing more types of protein toxins than any other bacterial genus, with several species acting as human pathogens.

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Clostridia are a group of low G+C gram-positive bacteria that are typically obligate anaerobes and capable of producing endospores.

Clostridia

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

The bacterium *Clostridioides difficile* is a common source of hospital-acquired infections that can result in serious and even fatal cases of colitis. These infections frequently occur in patients who are immunosuppressed or undergoing antibiotic therapy that alters the normal gastrointestinal microbiota.

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