A process in which a symbiont moves from one side of an epithelium to the other within its host organism. The host is defined as the larger of the organisms involved in a symbiotic interaction.
Synonyms:
exact_synonym:
migration in host through an epithelial cell layer; migration of symbiont within host by transepithelial trafficking; symbiont-mediated migration through host transepithelium; transepithelial migration of symbiont in host