Abstract
EVIDENCE has been recently presented to show that the ribonucleic acids isolated by phenol extraction from tobacco mosaic virus1, from ascites tumour cells in mice infected with Mengo encephalitis virus2 and from mouse brains with Eastern equine encephalitis virus3 are infectious. In the present communication, the infectivity of the ribonucleic acid isolated from the brains of mice infected with Semliki Forest virus is reported. This virus can also multiply in mosquitoes4 but causes no known human disease.
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