What is the primary function of interferons?

The primary function of interferons is to interfere with viral replication, which is why the correct answer is focused on this aspect. Interferons are a group of signaling proteins released by host cells in response to the presence of pathogens, particularly viruses. When a virus infects a cell, the cell can release interferons that then act on neighboring cells to prepare them against potential viral infections. This can involve inducing an antiviral state in those cells, making it more difficult for viruses to replicate and spread.

Interferons also play a critical role in the immune response by activating immune cells such as natural killer cells and macrophages, enhancing their ability to eliminate infected cells. They help in the communication between cells in the immune system, making them a vital component of the body's defense mechanisms against viral infections. Therefore, their primary role is indeed centered around inhibiting viral replication and bolstering the overall antiviral response.