An electron microscopic study addressed morphological changes induced
by rotavirus in the enterocyte-like cell line HT-29. Tubuloreticular s
tructures were found in the latest stages of viral infection when cell
s, undergoing a cytopathic effect, detached from the substrate. Tubulo
reticular structures were localized, together with viral particles, wi
thin highly dilated perinuclear cisternae. The results suggest that tu
buloreticular structures evolve during interaction of rotavirus with t
he rough endoplasmic reticulum membranes.