Having a weakened immune system caused by certain diseases or treatments.

Refers to an immune system incapable of fighting disease.

Not able to offer resistance to infection.

Lacking the normal ability (immune system) to respond to infection or tissue damage. Many factors, ranging from drugs to viral infection (e.g., HIV, AIDS) may affect the immune system adversely.

The state of having a deficient immune response either due to a primary immune disorder or to administration of immunosuppressive agents.

Having an immune system that is incapable of a normal, full reaction to pathogens or tissue damage, as the result of a disease (e.g., diabetes mellitus, overwhelming sepsis, or the acquired immunodeficiency syndrome) or drug therapy with agents that inhibit components of the immune system.

A condition characterized by the inhibition or impaired functionality of the immune system.

The term “immunocompromised” refers to individuals whose immune system activity has been weakened due to diseases like AIDS or cancer, or specific medical treatments like immunosuppressant drugs. Such individuals are at a higher risk than the average person to contract infections, especially opportunistic infections caused by organisms that typically do not pose a threat to healthy individuals.