Which immunoglobulin class is commonly elevated in parasitic infections as noted in serology?

Which immunoglobulin class is commonly elevated in parasitic infections as noted in serology?

• A. Increased IgA Levels
• B. Increased IgE Levels
• C. Increased IgG Levels
• D. Increased IgM Levels

Answer: (B)

Parasitic infections, especially helminths, typically trigger a Th2-skewed immune response that drives production of IgE. This IgE binds to parasites and to Fc receptors on mast cells and basophils. When parasite antigens cross-link those IgE molecules, mast cells and basophils release mediators that promote inflammation and recruit eosinophils. Eosinophils then unleash cytotoxic proteins that damage or kill the parasites. This IgE-mediated pathway is the hallmark you see in serology for parasitic infections, often reflected as elevated total IgE or parasite-specific IgE. Other antibodies are less characteristic for this context: IgM signals acute infection, IgG reflects longer-term exposure or prior infection, and IgA is more about mucosal immunity, not the classic serologic marker for parasites.

Parasitic infections, especially helminths, typically trigger a Th2-skewed immune response that drives production of IgE. This IgE binds to parasites and to Fc receptors on mast cells and basophils. When parasite antigens cross-link those IgE molecules, mast cells and basophils release mediators that promote inflammation and recruit eosinophils. Eosinophils then unleash cytotoxic proteins that damage or kill the parasites. This IgE-mediated pathway is the hallmark you see in serology for parasitic infections, often reflected as elevated total IgE or parasite-specific IgE. Other antibodies are less characteristic for this context: IgM signals acute infection, IgG reflects longer-term exposure or prior infection, and IgA is more about mucosal immunity, not the classic serologic marker for parasites.