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Isolation and Persistence of Chikungunya Virus in Cultures of Mouse Brain Cells

Department of Medicine, St Thomas' Hospital, London, S.E.1
^* Microbiological Research Establishment, Porton, England

Cultures of brain cells taken from mice at 1 to 3 days after peripheral infection with Chikungunya virus, showed loss of contact inhibition and morphological alterations which suggested that these cells may have been transformed. In cultures infected in vitro with a low dose of about 10⁴ LD₅₀/ml of culture medium, areas of epithelial-like cells and hypertrophied cells were dominant, cultures were destroyed after infection with a high dose of about 10⁶ LD₅₀/ml of culture medium. Cultures not destroyed by virus were studied for up to 4 months. The supernatant fluids of these cultures were titrated regularly in an adult mouse system in which the amounts of virus recorded varied from 10^3.7 to 10^6.0 LD₅₀/ml.

Received 9 November 1973; accepted 22 January 1974.