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Studies on the Cytopathic Effects of Newcastle Disease Virus: the Cytopathogenicity of Strain Herts 33 in five Cell Types

Central Veterinary Laboratory, New Haw, Weybridge, Surrey, U.K.

G. Hewlett^*, P. Reeve^* and G. Poste

Department of Virology, Royal Postgraduate Medical School, Ducane Road, London W12, U.K.

The cytopathogenicity and production of Newcastle disease virus (NDV) strain Herts cultivated in chick embryo (CE), baby hamster kidney (BHK-21), HEp-2, MDBK and L929 cells was investigated. Infection at high multiplicities (1000 p.f.u./cell) induced cell fusion in cultures of all cell types within 3 h after infection. Infection at low multiplicities (10 to 20 p.f.u./cell) produced extensive cell fusion in CE, BHK-21, HEp-2 and L929 cultures within 24 h, but MDBK cells failed to fuse. The latter cells failed to show high levels of virus haemagglutinin at the cell surface or accumulation of virus products, but infective virus was released to significantly higher titres than from the cell types which fused. However, infected MDBK showed similar levels of virus-induced cell damage to the plasma membrane, as measured by the release of lactate dehydrogenase, to HEp-2 and L929 cells which were susceptible to fusion. The morphology of the c.p.e. produced by strain Herts in the different cell types is described. The relationship of virus accumulation and virus release to the process of cell fusion is discussed.

^* Present address: Department of Bacteriology, University College Hospital Medical School, London, W.1., U.K.

Present address: Department of Experimental Pathology, Roswell Park Memorial Institute, 666 Elm Street, Buffalo, New York 14203, U.S.A.

Received 8 March 1973; accepted 20 June 1973.