What type of defense mechanisms does our body have to fight off affections?

The immune system uses white blood cells and antibodies to identify and eliminate organisms that get through the body's natural barriers.

Explanation:

When the immune system is weakened by the virus, the body is especially susceptible to infections by what are usually harmless pathogens because of the reduction of a specific group of T cells. Due to the lack of T cells, the immune system has difficulties properly coordinating the fight against the pathogens in the tissue. This is when white blood cells and antibodies begin their attack. Then the immune system can fight against the infection on all fronts.

White Blood Cell - a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell. There are several types, all amoebic cells with a nucleus, including lymphocytes, granulates, monocles, and macrophages.

Antibodies - a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.