The suppression of the body’s innate ability to repel disease and infection is known as immunosuppression. This suppression can result from a disease that targets the immune system, such as human immunodeficiency virus (HIV), or be the result of pharmaceutical agents used to fight certain conditions, such as cancer. In some cases of immunosuppression, this remedy is prescribed:

In some cases, immunosuppression can also be induced intentionally. This induction may be necessary for therapeutic interventions, such as tissue and organ transplants, to reduce the risk of organ rejection.

What are the causes of immunosuppression?
Immunosuppression can be caused by a number of systemic diseases. These include, but are not limited to:

Diabetes mellitus,
renal and/or hepatic insufficiency,
an infection of the central nervous system,
systemic lupus erythematosus,
rheumatoid arthritis.
In addition to systemic disease, certain pharmaceuticals and therapeutic interventions may also cause immunosuppression. These include, but are not limited to:

biological alkylating agents,
ionizing radiation.