Scanning electron microscope examination of epithelial cells infected with enveloped viruses.

The apical surface structure of virus infected epithelial cells (MDBK and MDCK) was examined in the SEM. Cells were infected with related enveloped viruses (influenza, Sendai, and vesicular stomatitis) under conditions of productive, nonproductive, and persistent infections. Fewer microvilli were seen in persistent infections with Sendai virus and the standard virus infected cells appeared to be normal. Extensive morphological changes, stunting of microvilli or budding effects, were noted in productive infections with influenza virus (WSN) and a reduction in the relative number of microvilli in a nonproductive infection with the PR8 strain. Although budding occurs on the basal lateral surface of VSV infected cells, morphological alterations were evident on the apical surface unlike that seen in influenza and Sendai virus infections.