Which organism is the causative agent of pinkeye (conjunctivitis)?

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Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

Multiple Choice

Which organism is the causative agent of pinkeye (conjunctivitis)?

Explanation:
Pinkeye is most classically caused by Haemophilus aegyptius, a fastidious gram-negative coccobacillus that commonly leads to acute contagious conjunctivitis with purulent discharge. This organism thrives on media that provide X (hemin) and V (NAD) factors, reflecting its relationship to the Haemophilus group. Moraxella lacunata can cause angular conjunctivitis but not the typical contagious pinkeye presentation. Chlamydia trachomatis causes inclusion conjunctivitis and trachoma, which have different clinical patterns, and Klebsiella ozaenae is associated with atrophic rhinitis rather than conjunctivitis. So Haemophilus aegyptius best explains the pinkeye scenario.

Pinkeye is most classically caused by Haemophilus aegyptius, a fastidious gram-negative coccobacillus that commonly leads to acute contagious conjunctivitis with purulent discharge. This organism thrives on media that provide X (hemin) and V (NAD) factors, reflecting its relationship to the Haemophilus group. Moraxella lacunata can cause angular conjunctivitis but not the typical contagious pinkeye presentation. Chlamydia trachomatis causes inclusion conjunctivitis and trachoma, which have different clinical patterns, and Klebsiella ozaenae is associated with atrophic rhinitis rather than conjunctivitis. So Haemophilus aegyptius best explains the pinkeye scenario.

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