USMLE Step 1 Quiz
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MICROBIOLOGY
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A 55-year-old farmer sustains a deep, contaminated wound from a piece of farm equipment. The wound is not properly cleaned. Several days later, he develops severe pain, swelling, and a foul-smelling discharge from the wound. On examination, crepitus is felt in the subcutaneous tissue. The causative organism, Clostridium perfringens, is known for its ability to survive in harsh environmental conditions, such as soil, for prolonged periods.
Which of the following bacterial structures is most responsible for the organism's long-term survival in the environment?
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