Glucosamine inhibited the formation of infectious fowl plague, Sindbis, and Semliki Forest virus but had little or no effect on the multiplication of vesicular stomatitis, Newcastle disease, and polio virus. 2-deoxy--glucose had a somewhat stronger effect than glucosamine. Only the production of virus glycoproteins seemed to be affected. Almost normal amounts of virus RNA and RNA polymerase were synthesized, and RNP-antigen activities reached control levels. After infection with fowl plague virus the nuclei and cytoplasm of cells incubated with glucosamine showed brilliant staining with fluorescent antibodies against RNP-antigen, whereas haemagglutinin-specific fluorescence was visible weakly in the cytoplasm. The virus-induced alterations of the cell surface, as measured by the agglutinability with Concanavalin A, were abolished by glucosamine.


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