Immunoglobulin M antibodies to hepatitis B core antigen: evaluation of enzyme immunoassay for diagnosis of hepatitis B virus infection.

Journal of Clinical Microbiology
M RoggendorfR Zachoval

Abstract

In acute and chronic hepatitis B, antibodies of the immunoglobulin M (IgM) class against the hepatitis B core antigen (anti-HBc IgM) have been demonstrated. For the determination of anti-HBc IgM, a sensitive enzyme immunoassay with anti-mu-coated flat-bottomed microtiter plates is described and evaluated. The specificity of the anti-HBc IgM test system was proven by pretreatment of presumed anti-HBc IgM-positive samples with anti-mu to block anti-HBc IgM. The test system was highly sensitive. In the acute stage of hepatitis B, anti-HBc IgM could be demonstrated in serum dilutions up to 10(-7) (mean titer, 10(-5)), and in sera from patients with chronic hepatitis B, the mean titer was 10(-3). In a study of unselected patients whose sera were sent at irregular intervals for testing, anti-HBc IgM persisted in a high percentage (52%) for at least 13 to 18 months after onset of illness despite the fact that these patients eliminated hepatitis B surface antigen (HBsAg) and produced antibodies to HBsAg (anti-HBs). By using the anti-HBc IgM test as an additional aid in the diagnosis of acute HBsAg-negative hepatitis, the hepatitis B etiology could be established in 13 of 42 patients (31.4%). Investigations of the prevalence of anti-HBc...Continue Reading

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