Direct immuno-electron microscopy and some morphological features of hog cholera virus

Characteristic particles of hog cholera virus were identified by direct immuno-electron microscopy. The virion is 40–50mμ, often asymmetrically shaped, and is enveloped in a membrane that bears 12–15 mμ surface projections. The surface projections are shear-sensitive and are antigenically different from the virion's envelope. They may represent hog cholera virus “soluble antigen”.