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A collection of 104-fecal specimens from 45 patients with hepatitis A, 14 patients with hepatitis B, 10 patients with non-A, non-B hepatitis, 6 patients with diseases other than hepatitis, and 18 healthy adults were studied for the presence of secretory immunoglobulin A and immunoglobulin M to hepatitis A virus by solid-phase enzyme-linked immunosorbent assay and immune electron microsopy. Specific fecal antibody was found only in patients with hepatitis A. Of 54 specimens from patients with hepatitis A, only 10 (18.5%) possessed detectable levels of fecal antibody, and each of these was collected within 10 days from the onset of dark urine. All 10 fecal specimens contained hepatitis A-specific secretory immunoglobulin A, and 4 were also positive for hepatitis A-specific immunoblobulin M. Four of the 10 antibody-positive specimens also contained hepatitis A virus particles which could be shown by immune electron microscopy to be coated with specific secretory immunoglobulin A. Since specific fecal antibody was not detected in all the patients with hepatitis A that were studied, it would appear to have limited diagnostic value, although its detection is evidence of recent infection.

Coproantibodies in hepatitis A: detection by enzyme-linked immunosorbent assay and immune electron microscopy