Antrax essays

Antrax essays Antrax is a rough infectious disease caused by Bacillus anthracis, a positive gram bacteria, aerobe formed from endospores, encapsulated, that can be half ordinary cultivated. The vegetative cell is large (1-8 microns in longitude, 1-1.5 microns wide). The size of a spore is approximately 1 micron. Spores grow rapidly in all cultivated ordinary labs at 37degrees celcius. Its cell morphology and colonial allows its identification by an experienced microbiologist, even though few microbiologists outside of the vetinary community have seen antrax colonies more than in text books. The three virulence factores are: the edema toxin, the deadly toxin and a capsular antigenic. Etymology: Anthracis originated from the Greek word for carbon, anthrakis, because the disease causes black superficial injuries like carbon. The toxic properties of B. anthracis were not recognized until 1954. Previously, due to the tremendous number of observed bacteria in infected animal blood (>109 bacteria/ ml), it was supposed that death was due to the capillary obstruction, But experimentaly it was demonstrated that only approximately 3 million cells/ml are necessary to cause the animals death. Besides, the animals plasmic infection cells contain a toxic that causes antrax symptoms when it is injected in normal rabbits. From these observations it is concluded that exotoxin plays an important role in the pathogeny of antrax. Cepas: There are two even varient colonial(s) a rough(r) that are related with the ability to form a capsule. The R varients are relativaly avirulent. The capsule is not toxic, it acts as protectionj against phagocytosis and it plays its most important role during the establishment of the disease, and a less significant role in the last phase of the disease that is measured by antrax toxin. An antrax toxin component has a deadly action form that at this time is not discovered. Death is apparantly due to th ...