If a bacterium releases toxins, which immune component neutralizes those toxins?

• A. Antibodies
• B. Phagocytes
• C. Complement
• D. Anti-toxins

Answer: (D)

Neutralizing toxins relies on antibodies binding to the toxin molecules. When an antibody attaches to a toxin, it blocks the toxin’s ability to interact with host cells or disrupt cellular functions, effectively neutralizing its harmful effects. This is a central function of humoral immunity: antibodies target toxins as well as pathogens. Anti-toxins are essentially antibody preparations directed against a specific toxin, used therapeutically to provide immediate neutralization after exposure. Phagocytes and the complement system play important roles in removing pathogens and aiding inflammation, but they don’t neutralize toxin activity in the same direct way that antibodies do. So the component that neutralizes toxins is antibodies, with anti-toxins representing a therapeutic use of those antibodies.