Enquist Photo (IMAGE) Princeton University Caption This is a model of herpes virus spread from neuron to skin cell: Herpes virus particles move via axonal transport inside a neuron. Upon exiting the neuron, only one or two viral particles enter the susceptible skin cell, resulting in a bottleneck that restricts viral spread. Credit Image courtesy of Matthew Taylor Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.