This paper describes the isolation and identification of a novel class of reoviruses, the so-called enteric reovirus strains (ERS). The pathogenicity, dissemination, induction of malabsorption syndrome (MAS), reaction pattern with different monoclonal antibodies, and serotype properties are reported. Upon screening of reoviruses in the field, it was observed that these reovirus strains were also present in other countries and were usually isolated from birds with MAS. Based on the data presented here, it is proposed that the so-called ERS are associated with MAS.
An immunochemical method has been developed for quantitative detection of DNA damage in mammalian cells. The method is based on the binding of a monoclonal antibody to single-stranded DNA. The clone producing this antibody (D1B) was obtained as a by-product from fusion of mouse myeloma cells with spleen cells isolated from a mouse immunized with chemically modified DNA. The technique is based upon the determination of the percentage single-strandedness resulting from the time-dependent partial unwinding of cellular DNA under alkaline conditions. Single- and double-strand DNA breaks, or lesions converted into such breaks in alkaline medium, form initiation points for the unwinding. The extent of unwinding from these points under defined conditions is a measure of the number of such sites. The method is rapid, does not require radioactive labelling of DNA or physical separation of single-from double-stranded molecules, is sufficiently sensitive to detect damage induced by 1 Gy of ionizing radiation and needs only small numbers of cells. The usefulness of the technique was demonstrated in a study of the induction of DNA damage and its repair in cultured Chinese hamster cells and in human white blood cells after exposure to 60Co-gamma-rays, and in white blood cells and bone marrow cells of X-irradiated mice. A dose-related DNA unwinding was observed and repair of DNA lesions was observed up to 60 min after irradiation.
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