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. 1998 Oct;95(2):208–213. doi: 10.1046/j.1365-2567.1998.00587.x

Immunity to vaginal HSV-2 infection in immunoglobulin A knockout mice.

M B Parr 1, G R Harriman 1, E L Parr 1
PMCID: PMC1364306  PMID: 9824477

Abstract

An immunoglobulin A (IgA) knockout (KO) mouse was used to study the role of IgA in protective immunity against vaginal infection with herpes simplex virus-type 2 (HSV-2). Intact and KO mice were immunized intravaginally (IVAG) with attenuated HSV-2, challenged IVAG with wild-type virus 6 weeks later and evaluated for vaginal infection and neurological disease. Non-immunized/challenged intact and KO mice showed vaginal infection and succumbed to neurological disease, while immunized/challenged mice exhibited reduced or no vaginal infection and no neurological disease. Log 2.5 enzyme-linked immunoassay (ELISA) titres of viral IgA, immunoglobulin G (IgG) and immunoglobulin M (IgM) in vaginal secretions collected from intact immune mice before challenge were 0.6+/-0.3, 6.4+/-0.32 and 0.0, while those in KO immune mice were 0.0, 6.7+/-0.19 and 3.0+/-0.29, respectively. Twenty-four hours after challenge, the percentage of vaginal epithelium that was infected in non-immune intact and KO mice was 2.0+/-0.6 and 2.4+/-0.6, which was reduced to 0.2+/-0.1 and 0.1+/-0.06 in immune intact and KO mice, respectively. No shed virus protein was detected in vaginal secretions 3 days after challenge in any immune mouse, whereas titres were 1400 and 1700 in the two groups of non-immune mice. Thus, immune protection against vaginal HSV-2 infection was similar in both KO and intact mice, indicating that this mucosal immunity does not depend mainly on IgA.

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Selected References

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