Abstract
Electron microscopical observations were performed on the midgut epithelia from Hyphantria cunea and Orgyia thyellina larvae infected with a Bombyx cytoplasmic-polyhedrosis virus (CPV). In the midgut epithelial cells of those insects, empty capsids of Bombyx CPV were increased in number, whereas normal virus replication and development of virogenic stroma were supressed. In the renewed epithelial cells which had been regenerated after the infected cells were discharged into the gut lumen, no histopathological lesion by virus infection was observed. In a few cells immediately after regeneration, however, virogenic stroma of small size were observed where empty capsids were assembled. Further, polyhedron protein and Bombyx CPV were not detected in the renewed cells by immunofluorecence technique. These results suggested that the renewed cells might acquire an ability to prevent the replication of Bombyx CPV.
