What are pyrogens known to do?

Pyrogens are substances typically produced by bacteria or derived from the breakdown of bacterial components that induce fever when they enter the body. They act on the hypothalamus, which is the part of the brain responsible for regulating body temperature. This response is part of the immune system's effort to fight off infection or clear out harmful substances. Therefore, when pyrogens are present, the body reacts by raising its temperature, leading to fever. This is an important physiological response that can enhance the immune response and help in fighting infections more effectively.