Which organism demonstrates porphyrin positivity?

Prepare for the CAMLPR Microbiology Test. Utilize flashcards and engaging multiple-choice questions, each equipped with descriptions and explanations. Ready yourself for an excellent performance!

Porphyrin positivity shows a bacterium can synthesize porphyrins (heme intermediates) on its own, so it yields a positive result in the porphyrin test without needing external precursors. Pasteurella multocida is known to be porphyrin positive, reflecting its intact heme biosynthesis pathway. In routine testing, this means it will glow or test positive for porphyrin presence, helping distinguish it from other organisms that do not produce porphyrins endogenously. The other listed bacteria are not characteristically porphyrin positive in standard panels, so they don’t give that positive result. This trait helps labs differentiate Pasteurella from Haemophilus species and related organisms.