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.
When something that is non-self, or foreign, is encountered, the immune system attacks it to help prevent infection or other injury. 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. Immune deficiencies can also be acquired as a result of aging, diabetes, infections, cancer treatments, or medications.