An interferon is a protein produced by the body's cells in response to a viral infection. It plays a crucial role in the immune system's defense against viruses. When a cell is infected by a virus, it releases interferons to warn neighboring cells of the viral threat. This helps activate those cells to heighten their antiviral defenses.
Interferons do not directly kill viruses; instead, they inhibit viral replication within cells. By interfering with the virus's ability to replicate, interferons help contain the spread of the infection. Therefore, the statement "An interferon activates the body's immune system response to a virus" is accurate.
In summary, interferons are essential components of the body's defense mechanism against viral infections, serving to alert and activate the immune system to combat invading viruses effectively.
