Characterization of the host immune response in human Ganglia after herpes zoster.
Level 4 - case-series / case-control
Case series of post-mortem human tissue specimens
PubMed 20573825 · doi:10.1128/JVI.01020-10
What was done
Immunostaining was performed on seven sensory ganglia collected post-mortem from three donors who had suffered from herpes zoster 1 to 4.5 months before death (dying from other causes). The researchers analyzed the cellular localization of varicella-zoster virus (VZV) antigen and phenotyped the infiltrating immune cell populations.
What was found
VZV antigen localized almost exclusively to neurons and persisted long after rash resolution in at least one donor. A large immune infiltrate was observed, primarily consisting of noncytolytic CD8(+) T cells, with smaller amounts of CD4(+) T cells, B cells, NK cells, and macrophages, and zero dendritic cells. VZV antigen-positive neurons lacked detectable MHC class I expression, and CD8(+) T cells did not surround infected neurons. No quantitative counts or statistical metrics were provided in the abstract.
Why it matters
This study provides direct pathological evidence from human tissue that non-latency-associated viral antigen and noncytolytic inflammation can persist in sensory ganglia for months after acute shingles resolves.
Limits
The study is based on an extremely small sample size (three donors, seven ganglia) evaluated post-mortem. The abstract reports no uninfected control ganglia, no numeric quantification of immune subsets, and cannot establish the functional kinetics or clinical correlation with postherpetic neuralgia severity.
Cited by
- context Nerve pain during herpes virus reactivation is largely caused by the immune system reacting to the virus exiting neurons and killing off those neurons.