For suspected HSV infection with central nervous system involvement, which diagnostic test is preferred for detecting HSV DNA in CSF?

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Multiple Choice

For suspected HSV infection with central nervous system involvement, which diagnostic test is preferred for detecting HSV DNA in CSF?

PCR testing for HSV DNA in CSF is the test of choice when HSV encephalitis is suspected because it is highly sensitive and specific and provides rapid results, which is crucial for guiding urgent treatment. Tzanck smear is limited to mucocutaneous lesions and cannot diagnose CNS HSV infection, and it has poor sensitivity. CSF culture takes longer and is less reliable, especially after antiviral therapy. Serology for HSV antibodies in CSF isn’t useful for acute diagnosis because antibodies may reflect past exposure or require time to develop. In suspected HSV CNS infection, start acyclovir empirically while awaiting CSF PCR results.

PCR testing for HSV DNA in CSF is the test of choice when HSV encephalitis is suspected because it is highly sensitive and specific and provides rapid results, which is crucial for guiding urgent treatment. Tzanck smear is limited to mucocutaneous lesions and cannot diagnose CNS HSV infection, and it has poor sensitivity. CSF culture takes longer and is less reliable, especially after antiviral therapy. Serology for HSV antibodies in CSF isn’t useful for acute diagnosis because antibodies may reflect past exposure or require time to develop. In suspected HSV CNS infection, start acyclovir empirically while awaiting CSF PCR results.

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