What is the immune response to enteroviral infections?

Updated: Mar 01, 2018
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Immunity to enterovirus is serotype-specific. Intact humoral immunity is required for the control and eradication of enteroviral disease.

T lymphocytes do not contribute to viral clearance and, in coxsackievirus B3 myocarditis, may contribute to myocardial inflammation. [19]

Humoral immunity (antibody-mediated) mechanisms operate both in the alimentary tract (to prevent mucosal infection) and in the blood (to prevent dissemination to target organs).

Secretory immunoglobulin A (IgA) appears in nasal and alimentary secretions 2-4 weeks after the administration of live-attenuated oral poliovirus vaccine (OPV) and persists for at least 15 years. [20] Upon re-exposure to infectious virus, high titers of secretory IgA antibodies prevent or substantially reduce poliovirus shedding; higher secretory IgA titers lead to better immunity. [20]

Immunoglobulin M (IgM) antibodies appear as early as 1-3 days after enteroviral challenge and disappear after 2-3 months. [20]

Immunoglobulin G (IgG) antibody, which is generally detected 7-10 days after infection, is mostly of the IgG1 and IgG3 subtypes. Serum neutralizing IgG antibodies persist for life after natural enteroviral infections. [21]

Macrophage function is also a critical component of the immune response in enteroviral infections; ablation of macrophage function in experimental animals markedly enhances the severity of coxsackievirus B infections. [22]


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