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J Clin Microbiol. 1992 August; 30(8): 2165-2168

Presence of specific immunoglobulin A-secreting cells in peripheral blood after natural infection with Shigella sonnei.

N Orr, G Robin, G Lowell and D Cohen

Medical Corps, Israel Defence Force.

ABSTRACT

The appearance of antigen-specific immunoglobulin A (IgA) antibody-secreting cells (ASCs) following natural infection with Shigella sonnei during a common-source outbreak caused by this organism was evaluated in a modified enzyme-linked immunosorbent assay (ELISPOT). A mean IgA ASC value of 2,131.6/10(6) cells against homologous S. sonnei lipopolysaccharide (LPS) was detected in blood samples obtained from patients with bacteriologically proven S. sonnei shigellosis 5 and 10 days after the onset of disease. In the same blood samples, the level of ASC measured against heterologous antigen (Shigella flexneri serotype 2a LPS) was significantly lower than that of the homologous antigen (mean value, 33.12/10(6) cells). Furthermore, the mean number of activated B cells that secreted anti-S. sonnei LPS antibodies was significantly higher among patients with S. sonnei shigellosis than it was among patients with non-Shigella diarrhea (2.5/10(6) cells; standard error, 1.0) and healthy subjects (5.1/10(6) cells; standard error, 2.3) (P less than 0.05). The anti-LPS IgA ASC activity was easily detected within 5 days of the onset of disease, a point at which the levels of anti-S. sonnei LPS IgG and even IgA antibodies were hardly detectable in serum.

J Clin Microbiol. 1992 August; 30(8): 2165-2168




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