For suspected Chlamydia trachomatis conjunctivitis, how should the specimen be collected and confirmed?

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Multiple Choice

For suspected Chlamydia trachomatis conjunctivitis, how should the specimen be collected and confirmed?

Explanation:
Chlamydia trachomatis is an obligate intracellular pathogen, so it cannot be reliably detected by routine bacterial culture or direct Gram staining. To diagnose it, you need a method that allows the organism to grow inside living host cells and then confirm its identity with a molecular test. In practice, this means inoculating the specimen onto susceptible cell lines such as McCoy or HeLa cells so the Chlamydia can replicate. After growth, a molecular assay like multiplex PCR is used to identify the organism, often using urine or cervical/urethral specimens for the confirmation test. Direct Gram stain of conjunctival scrapings is not reliable for Chlamydia, and culture on MacConkey agar or a blood culture would not detect it.

Chlamydia trachomatis is an obligate intracellular pathogen, so it cannot be reliably detected by routine bacterial culture or direct Gram staining. To diagnose it, you need a method that allows the organism to grow inside living host cells and then confirm its identity with a molecular test. In practice, this means inoculating the specimen onto susceptible cell lines such as McCoy or HeLa cells so the Chlamydia can replicate. After growth, a molecular assay like multiplex PCR is used to identify the organism, often using urine or cervical/urethral specimens for the confirmation test. Direct Gram stain of conjunctival scrapings is not reliable for Chlamydia, and culture on MacConkey agar or a blood culture would not detect it.

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