Which Haemophilus species shows red fluorescence for ALA-porphyrins during testing?

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Multiple Choice

Which Haemophilus species shows red fluorescence for ALA-porphyrins during testing?

ALA-porphyrin testing relies on detecting porphyrin synthesis in the heme pathway. When aminolevulinic acid is provided, bacteria that can convert it into porphyrins accumulate these compounds, and protoporphyrin IX fluoresces red under the test’s illumination. Haemophilus parainfluenzae has this capability, so it glows red in this assay. The other Haemophilus species listed do not produce this red fluorescence under the same conditions, which is why this pattern helps distinguish H. parainfluenzae in the testing panel.

ALA-porphyrin testing relies on detecting porphyrin synthesis in the heme pathway. When aminolevulinic acid is provided, bacteria that can convert it into porphyrins accumulate these compounds, and protoporphyrin IX fluoresces red under the test’s illumination. Haemophilus parainfluenzae has this capability, so it glows red in this assay. The other Haemophilus species listed do not produce this red fluorescence under the same conditions, which is why this pattern helps distinguish H. parainfluenzae in the testing panel.

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