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. 1967 Feb;1(1):215–237. doi: 10.1128/jvi.1.1.215-237.1967

Morphogenesis of Type 2 Parainfluenza Virus Examined by Light and Electron Microscopy

C Howe 1, C Morgan 1, C de Vaux St Cyr 1, K C Hsu 1, H M Rose 1
PMCID: PMC375521  PMID: 4318944

Abstract

The development of type 2 parainfluenza virus in HeLa and stable human amnion cells was examined by use of antisera labeled with fluorescein and ferritin. Serum containing antibody predominantly to soluble viral antigen gave specific fluorescence which was first detectable in small cytoplasmic foci 8 to 10 hr after initiation of infection. By 20 to 24 hr, when the production of infective virus and hemagglutinin was maximal, large perinuclear aggregates of fluorescence were observed which corresponded in distribution and time of appearance to the eosinophilic inclusions seen in similar preparations stained with azure eosin. The inclusions, examined by electron microscopy, were composed of fibrils, presumably viral ribonucleoprotein, which specifically bound the antibody labeled with ferritin. With antiserum to concentrated virus, on the other hand, specific fluorescence was most marked at the surface of infected cells. Foci of fluorescence at the surface represented segments of membrane which had become differentiated morphologically and antigenically to resemble the viral envelope. These were the sites where mature virions appeared. The latter exhibited marked pleomorphism; in some instances, particles were formed which lacked recognizable internal fibrils but which possessed an enclosing membrane bearing viral antigen. Filamentous forms showing an organized internal structure were also observed at the cell surface, but were never encountered in negatively stained preparations. No clear relationship between these filaments and the spherical or oval forms could be established. In negatively stained preparations, nucleocapsid released by rupture of viral particles was similar in appearance to that reported for other paramyxoviruses. It seems probable that this component has a helical configuration.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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