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  • Title: Cytopathogenic effect of African swine fever virus for pig monocytes: characterization and use in microassay.
    Author: Knudsen RC, Genovesi EV, Whyard TC, Wool SH.
    Journal: Vet Microbiol; 1987 May; 14(1):15-24. PubMed ID: 3307125.
    Abstract:
    A microculture assay is described for the titration of African swine fever virus (ASFV) using swine monocytes contained in mononuclear leucocyte (MNL) microcultures. Titration endpoints were determined by observing cytopathogenic effects (CPE) of ASFV infected monocytes with an inverted microscope at 40 X magnification. CPE was a late event following the detection of ASFV antigens in monocytes by radioimmune assay, immunofluorescence and hemadsorption. It began with the detachment, enlargement and rounding of monocytes which progressively formed into grape-like clusters of 3-20 or more cells which eventually lysed. The characteristic CPE was produced in monocyte microcultures by virulent, moderately virulent, Vero cell adapted, and nonhemadsorbing ASFV strains. The sensitivity and reproducibility of the CPE microassay was similar to that of the hemadsorption microassay.
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