Capsules increase virulence of some organisms because they pre â¦ vent desiccation, are able to stick to surfaces and provide a mechanism for attachment to tissue such as respiratory epithelial tissue in humans. Capsules are also slippery and often evade a human's immune system by avoiding phagocytosis from certain leukocytes.
Definition of DEFICIENCY DISEASE. : a disease (as scurvy) caused by a lack of essential dietary elements and especially a vitamin or mineral.
Definition of Primary immunodeficiency disease. Primary immunodeficiency disease: A disorder caused by an inherited flaw in the immune system that increases the susceptibility to infections.Primary immunodeficiency diseases are unlike secondary or acquired immune deficiency diseases, which are caused by infectious, chemical or radiological agents.efinition of Primary immunodeficiency disease. Primary immunodeficiency disease: A disorder caused by an inherited flaw in the immune system that increases the susceptibility to infections.