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An enzyme immunoassay inhibition assay was developed to detect rat rotavirus-like agent (RVLA) or antigenically related viruses in intestinal washings and homogenates obtained from diarrheic rats and in fecal specimens obtained from diarrheic humans. In this assay, RVLA antigens in a test sample inhibited the binding of a biotin-labeled anti-rat RVLA antibody preparation to rat RVLA antigens bound to the solid phase. Intestinal washings and homogenates obtained 1 day after RVLA infection of suckling rats inhibited the binding of the biotin-labeled antibody to the solid-phase rat RVLA antigens by 76 to 100%. The inhibition was blocked by RVLA immune rat serum but not by nonimmune rat serum. Of 27 fecal specimens obtained from diarrheic humans, 6 produced disease characteristic of rat RVLA infection when inoculated into suckling rats. Four of these six specimens produced greater than 50% inhibition in the enzyme immunoassay. Fecal specimens obtained from diarrheic humans that were determined to be negative for RVLA produced an average inhibition of 9.2%. This enzyme immunoassay appears to be a useful diagnostic and research tool for the study of infections with at least one of the antigenically distinct rotaviruses.

journal of clinical microbiology

Enzyme immunoassay inhibition assay for the detection of rat rotavirus-like agent in intestinal and fecal specimens obtained from diarrheic rats and humans