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J Clin Microbiol. 1986 December; 24(6): 947-953

Antibody response in group B meningococcal disease determined by enzyme-linked immunosorbent assay with serotype 15 outer membrane antigen.

S Harthug, E Rosenqvist, E A Høiby, T W Gedde-Dahl and L O Frøholm

ABSTRACT

To elucidate pathogenic aspects and serodiagnostic possibilities for meningococcal disease, we investigated levels of specific antimeningococcal immunoglobulin G (IgG), IgA, and IgM in serum by using an enzyme-linked immunosorbent assay with outer membrane antigen prepared from a Neisseria meningitidis B:15:P1.16 strain. Serum samples were drawn on hospital admission as well as during convalescence from patients suspected of purulent meningitis or meningococcal septicemia, and single samples were drawn from population controls. A total of 637 samples were examined blindly. On admission, the average antimeningococcal immunoglobulin levels were about the same in the meningococcal disease patients as in the population controls. Septicemic patients, however, had significantly lower values. During one week the mean specific immunoglobulin levels in meningococcal-disease patients increased 6 times for IgG, 14 times for IgA, and 5 times for IgM. Children younger than 1 year showed a modest and more slowly developing antibody response. There were no statistically significant differences in average antibody responses among patients infected with meningococci of different serotypes. At 100% specificity, the increase in IgG, IgA, and IgM yielded diagnostic sensitivities for meningococcal disease of 84, 52, and 66%, respectively. One of seven serum pairs from the patient control group with unknown etiology was positive for meningococcal disease in this assay. The patients with meningococcal disease originally diagnosed only by clinical signs and symptoms showed a slightly lower rate of seroconversion than the patients in whom the diagnosis was supported by test results showing a systemic Neisseria meningitidis isolate.

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J Clin Microbiol. 1986 December; 24(6): 947-953

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