Automated, quantitative cytopathic effect reduction assay for interferon

Abstract
A rapid, cytopathic effect reduction assay for human inferferon (IFN) is described. Dilutions of IFN were made with an automated diluter in 96-well microtiter plates. Total incubation time was 26 h. IFN titers were calculated from optical density readings of crystal violet-stained [human amnion WISH] monolayers in an automated spectrophotometer, which required < 1 min to read each plate.