Which organism is a Gram-positive bacillus with boxcar morphology and a positive reverse CAMP test?

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Multiple Choice

Which organism is a Gram-positive bacillus with boxcar morphology and a positive reverse CAMP test?

Understanding the features helps you identify the organism. Boxcar morphology refers to short, straight rods with blunt ends, a classic description for Clostridium species. Clostridium perfringens is a Gram-positive, anaerobic bacillus that is frequently described this way on Gram stain. The reverse CAMP test is a lab reaction that, in this context, is positive for Clostridium perfringens, providing a distinctive tool to confirm its identity. Among the options, only this organism consistently matches both the boxcar-shaped rod appearance and the positive reverse CAMP result, whereas the others are either cocci or do not fit the described test pattern. So the description points to Clostridium perfringens.

Understanding the features helps you identify the organism. Boxcar morphology refers to short, straight rods with blunt ends, a classic description for Clostridium species. Clostridium perfringens is a Gram-positive, anaerobic bacillus that is frequently described this way on Gram stain. The reverse CAMP test is a lab reaction that, in this context, is positive for Clostridium perfringens, providing a distinctive tool to confirm its identity. Among the options, only this organism consistently matches both the boxcar-shaped rod appearance and the positive reverse CAMP result, whereas the others are either cocci or do not fit the described test pattern. So the description points to Clostridium perfringens.

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