The body has several mechanisms to fight disease, one of which is sending chemical messengers. The messengers released by lymphocytes, monocytes, and macrophages have differing roles in the immune response. Which messenger enables cells to resist viral replication and slow viral replication?

Interferons.

Explanation:

Immune system of the body protects the organism from the diseases causing pathogens. The main cells of the immune system are monocytes, macrophages, lymphocytes and interferons.

Interferons are the chemical released by the body to provide immunity to the organism. Interferons are mainly responsible for the cells to slow the viral replication and enables the cells to resist the viral infection.

Thus, the answer is interferons.