Researchers at the University of Colorado Anschutz reported in Annals of Neurology that circulating exosomes may help explain lingering pain after shingles (post-herpetic neuralgia). In lab experiments, exosomes collected from PHN patients triggered nerve-cell changes similar to those seen during viral infection, even without virus present. The team describes a “failure-to-resolve” model in which exosome-mediated signaling persists after viral clearance and sustains maladaptive neuronal remodeling. The findings identify exosome cargo as a potential mechanistic target and could support future development of prediction and treatment strategies aimed at preventing chronic shingles pain.