Which organism is a large, spore-forming rod historically linked to anthrax?

Which organism is a large, spore-forming rod historically linked to anthrax?

• A. Bacillus anthracis
• B. Clostridium perfringens
• C. Bacillus cereus
• D. Staphylococcus aureus

Answer: (A)

Anthrax is classically caused by a large, spore-forming rod, specifically Bacillus anthracis. Bacteria in the Bacillus genus are Gram-positive, rod-shaped, and capable of forming endospores that help them survive harsh conditions. Among these, Bacillus anthracis is the species historically linked to anthrax, giving rise to the disease in its various forms. In contrast, the other options include a spore-forming rod that is typically anaerobic (Clostridium perfringens, associated with gas gangrene), another spore-forming rod that mainly causes food poisoning (Bacillus cereus), and a non-spore-forming cocci (Staphylococcus aureus), which does not align with the organism historically linked to anthrax.

Anthrax is classically caused by a large, spore-forming rod, specifically Bacillus anthracis. Bacteria in the Bacillus genus are Gram-positive, rod-shaped, and capable of forming endospores that help them survive harsh conditions. Among these, Bacillus anthracis is the species historically linked to anthrax, giving rise to the disease in its various forms. In contrast, the other options include a spore-forming rod that is typically anaerobic (Clostridium perfringens, associated with gas gangrene), another spore-forming rod that mainly causes food poisoning (Bacillus cereus), and a non-spore-forming cocci (Staphylococcus aureus), which does not align with the organism historically linked to anthrax.