What is the pathophysiology of cutaneous rash in herpes zoster (shingles)?

Updated: Jan 25, 2019
  • Author: Camila K Janniger, MD; Chief Editor: Dirk M Elston, MD  more...
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Answer

The frequency of dermatologic involvement is correlated with the centripetal distribution of the initial varicella lesions. This pattern suggests that the latency may arise from contiguous spread of the virus during varicella from infected skin cells to sensory nerve endings, with subsequent ascent to the ganglia. Alternatively, the ganglia may become infected hematogenously during the viremic phase of varicella, and the frequency of the dermatome involvement in herpes zoster may reflect the ganglia most often exposed to reactivating stimuli.

The appearance of the cutaneous rash due to herpes zoster coincides with a profound VZV-specific T-cell proliferation. Production of interferon alfa appears with the resolution of herpes zoster. In immunocompetent patients, specific antibodies (immunoglobulins G, M, and A [IgG, IgM, and IgA]) appear more rapidly and reach higher titers during reactivation (herpes zoster) than during the primary infection. The patient has a long-lasting, enhanced, cell-mediated immunity response to VZV. [11, 12, 13]

The anatomic location of the involved dermatome often determines the specific manifestations. When cervical and lumbar roots are involved, motor involvement, which is often overlooked, may be evident, depending on the virulence or extent of migration. In at least 1 case of motor neuron involvement, lymphocytic infiltration and myelin breakdown were observed with preservation of axons.


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