How does fever help the body fight infection?

• A. It slows metabolism but has no impact on immunity.
• B. It inhibits pathogen growth and enhances immune cell activity.
• C. It directly kills pathogens.
• D. It only causes fever and provides no immune benefit.

Answer: (B)

Fever is part of the body's immune response that uses temperature as a tool to fight infection. By raising the body's temperature, many pathogens lose ground because they don’t tolerate heat as well as our immune defenses do. At higher temperatures, immune cells work more effectively: neutrophils and macrophages can phagocytose and kill invaders more efficiently, and T cells proliferate and coordinate responses more rapidly. Fever also boosts the production and action of signaling molecules that ramp up the immune response and improve antigen presentation, helping the body recognize and attack the invaders more efficiently. It’s not that fever directly destroys pathogens; rather, the warmer environment slows pathogen growth and strengthens the immune system’s ability to clear them. Very high fevers can be dangerous, so it’s important to monitor and manage fever if it becomes extreme or persistent.