Final answer:
The substances present in a variety of immunologic diseases include agammaglobulinemia, severe combined immunodeficiency (SCID), HIV/AIDS, and chronic granulomatous disease. These diseases are characterized by abnormalities in the immune system that result in increased susceptibility to infections and other complications.
Step-by-step explanation:
The substances present in a variety of immunologic diseases include agammaglobulinemia, severe combined immunodeficiency (SCID), HIV/AIDS, and chronic granulomatous disease. These diseases are characterized by abnormalities in the immune system that result in increased susceptibility to infections and other complications.
For example, agammaglobulinemia is a condition where the body lacks or has very low levels of immunoglobulins (antibodies), making individuals prone to recurrent bacterial infections.
SCID is a rare genetic disorder that affects both the B cell and T cell arms of the adaptive immune response, leading to severe immunodeficiency. HIV/AIDS is a viral infection that attacks and weakens the immune system, making individuals susceptible to opportunistic infections and certain types of cancers. Chronic granulomatous disease is a genetic disorder that impairs the function of certain immune cells, resulting in recurrent severe infections.
Overall, these substances play a key role in the immunologic diseases by affecting the functioning of the immune system and increasing the risk of infections.