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.
Immune deficiency conditions occur when the immune system is unable to do its job. Immune deficiency conditions can be present at birth as a result of genetic defects in any of the components of the immune system. Such conditions are called primary immune deficiencies.