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.
color vision deficiency see color vision deficiency. deficiency disease a condition due to dietary or metabolic deficiency, including all diseases caused by an insufficient supply of essential nutrients.iron deficiency deficiency of iron in the system, as from blood loss, low dietary iron, or a disease condition that inhibits iron uptake.See iron and iron deficiency anemia.olor vision deficiency see color vision deficiency. deficiency disease a condition due to dietary or metabolic deficiency, including all diseases caused by an insufficient supply of essential nutrients.