A student infected by a common cold virus ran low-grade fever. After few days the temperature returned to normal and was free of symptoms. The fever served as?

The fever served as a defense mechanism against the virus.

When the body is infected by a virus, the immune system responds by releasing chemicals called pyrogens. These pyrogens cause the body's temperature to rise, which helps to kill the virus. The fever also helps to speed up the body's metabolism, which helps to produce more white blood cells to fight off the infection.

In the case of the student, the fever served as a defense mechanism against the common cold virus. The fever helped to kill the virus and speed up the recovery process.