Gradient Plate Technique Applied to the Study of Antiviral Substances.

Abstract
Summary The gradient plate technique, originally used in bacteriology, was adapted to the study of virus inhibition by known antiviral compounds, including pyrimidine nucleo-sides, thiosemicarbazones, amantadine, guanidine, and -hydroxybenzylbenzimidazole, all of which produced striking antiviral effects. Reversal of 5-iodo-2′-deoxyuridine (IUdR) activity by thymidine was readily quantified by using this method. The technique was applicable to the bioassay of IUdR and guani-dine and to the ready detection and isolation of IUdR-resistant strains of herpes simplex virus.

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