All of the following are known mechanisms of avoiding the...

All of the following are known mechanisms of avoiding the effects of antibodies except
a) antigenic variation.
b) mimicking "self."
c) synthesis of an Fc receptor.
d) synthesis of IgG protease.
e) remaining intracellular.

Key Concepts

Intracellular Survival

Intracellular survival is a strategy where pathogens invade and reside within host cells to evade the immune system. While this limits the exposure to antibodies—which predominantly act in extracellular fluids—it is more a means of hiding from the humoral response rather than an active mechanism to counteract the effects of antibodies.

IgG Protease Production

Certain bacteria produce enzymes known as IgG proteases that specifically cleave IgG antibodies. By degrading these antibodies, the pathogens effectively neutralize a major component of the humoral immune response, impairing opsonization and other antibody-dependent functions.

Antigenic Variation

Antigenic variation refers to the process by which pathogens alter their surface proteins to avoid recognition by the host’s immune system. By constantly changing the antigenic structure, these pathogens can escape detection and neutralization by antibodies that were generated against previous versions of the antigen.

Molecular Mimicry

Molecular mimicry involves the pathogen expressing antigens that closely resemble host components. This similarity confuses the immune system, as it may fail to recognize the pathogen as foreign, thereby reducing the effectiveness of antibody-mediated responses.

Fc Receptor-Mediated Immune Evasion

Some pathogens synthesize Fc receptor proteins that bind to the Fc portion of antibodies. This binding interferes with the normal immune functions of antibodies, such as opsonization and complement activation, thus protecting the pathogen from immune clearance.

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