Which characteristic is true of clostridium tetani and clostridium difficile?

Which characteristic is true of clostridium tetani and clostridium difficile?

• A. Are gram-negative bacilli
• B. Are anaerobic
• C. Are always pathogenic
• D. Cause tinea infections

Answer: (B)

Clostridium tetani and Clostridium difficile are both classified as anaerobic bacteria, meaning they thrive in environments devoid of oxygen. This characteristic is significant in a clinical setting as it influences how these organisms are cultured and treated. Clostridium tetani is the causative agent of tetanus, a potentially fatal disease characterized by muscle spasms, while Clostridium difficile is known for causing antibiotic-associated diarrhea and colitis, particularly after disruptions to normal gut flora. Their anaerobic nature is essential for their survival and propagation, as exposure to oxygen can be detrimental to them. This foundational trait is critical in understanding the epidemiology and treatment approaches for infections caused by these bacteria. In contrast, the other characteristics mentioned do not apply to both organisms: they are not gram-negative bacilli, though Clostridium difficile is gram-positive; they are not always pathogenic—Clostridium tetani requires specific conditions to cause disease, and Clostridium difficile can exist in a non-pathogenic state (as part of the gut flora) before overgrowth occurs; and they do not cause tinea infections, which are fungal in nature, not bacterial.

Clostridium tetani and Clostridium difficile are both classified as anaerobic bacteria, meaning they thrive in environments devoid of oxygen. This characteristic is significant in a clinical setting as it influences how these organisms are cultured and treated. Clostridium tetani is the causative agent of tetanus, a potentially fatal disease characterized by muscle spasms, while Clostridium difficile is known for causing antibiotic-associated diarrhea and colitis, particularly after disruptions to normal gut flora.

Their anaerobic nature is essential for their survival and propagation, as exposure to oxygen can be detrimental to them. This foundational trait is critical in understanding the epidemiology and treatment approaches for infections caused by these bacteria.

In contrast, the other characteristics mentioned do not apply to both organisms: they are not gram-negative bacilli, though Clostridium difficile is gram-positive; they are not always pathogenic—Clostridium tetani requires specific conditions to cause disease, and Clostridium difficile can exist in a non-pathogenic state (as part of the gut flora) before overgrowth occurs; and they do not cause tinea infections, which are fungal in nature, not bacterial.