A Gram-positive bacillus with long C shapes, catalase negative, alpha-hemolysis on blood agar. Which organism best fits this profile?

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Multiple Choice

A Gram-positive bacillus with long C shapes, catalase negative, alpha-hemolysis on blood agar. Which organism best fits this profile?

The main idea is recognizing a Gram-positive rod with a slender, curved shape. Lactobacilli are long, curved or coccobacillary Gram-positive rods that are catalase negative, setting them apart from catalase-positive rods like Bacillus and Clostridium, as well as from Staphylococcus aureus which are cocci. On blood agar, many lactobacilli produce alpha-hemolysis, which matches the given pattern. Putting those clues together—the curved, non-spore-forming Gram-positive rod that is catalase negative and shows alpha-hemolysis—the organism that fits best is Lactobacilli.

The main idea is recognizing a Gram-positive rod with a slender, curved shape. Lactobacilli are long, curved or coccobacillary Gram-positive rods that are catalase negative, setting them apart from catalase-positive rods like Bacillus and Clostridium, as well as from Staphylococcus aureus which are cocci. On blood agar, many lactobacilli produce alpha-hemolysis, which matches the given pattern. Putting those clues together—the curved, non-spore-forming Gram-positive rod that is catalase negative and shows alpha-hemolysis—the organism that fits best is Lactobacilli.

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