Cellular Growth Essay

481 WordsJun 22, 20152 Pages
Cellular Structures and Pathogenicity Microbiology Tanisha Forrest March 30, 2015 There are many different structures that affect the pathogenicity of bacteria cells. The capsule protect the bacteria cell from opsonization and phagocytosis, the fimbriae which help bacteria attach to certain sites in the body this helps them from being washed away by body fluids, flagella these long tail structures that help bacteria move. These help bacteria migrate to its site of infection and survive, they help increase the bacterial pathogenicity. The capsule is a protective layer that surrounds the cell wall. Only certain bacteria are capable of forming a capsule. Capsules usually consist of complex polysaccharide molecules arranged in loose gel. When an encapsulated bacterium invades a host the capsule prevents the host defense mechanisms from destroying the bacteria. If bacteria lose their capsules they become less likely to cause disease and are easily destroyed. Most capsules are hydrophilic and help bacteria avoid destruction by preventing the loss of water. Capsules and fimbriae are the main structural components of Klebsiella Pneumoniae; a gram-negative bacterium; on the cell surface they play an important role in its survival and pathogenicity. K. Pneumoniae is healthcare acquired infection spread from person to person. Those on ventilators or IV catheters or taking long term antibiotics; due to the interruption of the body’s normal flora have a great risk for developing these bacteria. It enters through the respiratory tract to cause pneumonia or enters the blood to cause infection in the bloodstream. If it occurs in the lungs destructive changes can occur such as, inflammation, necrosis, and hemorrhage within the lung tissue. K. pneumoniae have specific antigens on their cell surface to contribute to the pathogenicity, O antigen and K antigen. The capsule of K.

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