Step 1: Understanding the Concept:
Cells of the immune system communicate through chemical signals.
Step 2: Detailed Explanation:
Interferons are a class of cytokines released by virus-infected cells.
They act as chemical messengers that activate other immune cells like Natural Killer (NK) cells and Macrophages to destroy infected cells and pathogens.
Step 3: Final Answer:
The messengers are Cytokines, specifically Interferons.