How does fever indicate that your body's immune system is doing its job?

Question

Fever increases red blood cell production.
Fever raises the body's temperature to destroy harmful substances.
Fever triggers inflammation.
Fever causes the secretion of hormones that fight harmful substances.

Answer 1

Fever raises the body's temperature to destroy harmful substances. When the body is infected with bacteria or viruses, the immune system responds by releasing chemicals called pyrogens that act on the hypothalamus in the brain to raise the body's temperature. This rise in temperature helps to slow down the growth and replication of the harmful substances, allowing the immune system to more effectively fight off the infection. So, fever is a sign that the body's immune system is actively working to combat an infection.