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Mycobacterium tuberculosis (M. tb), also known as Koch's bacillus, is a species of pathogenic bacteria in the family Mycobacteriaceae and the causative agent of tuberculosis. [ 1 ] [ 2 ] First discovered in 1882 by Robert Koch , M. tuberculosis has an unusual, waxy coating on its cell surface primarily due to the presence of mycolic acid .
The abbreviation TB is short for tubercle bacillus. Consumption was the most common nineteenth century English word for the disease, and was also in use well into the twentieth century. The Latin root con meaning 'completely' is linked to sumere meaning 'to take up from under'. [204]
Short, relatively plump bacilli (rods) in tissue smears, large slender beaded rods in culture. They have no flagella or fimbria, and no capsule. [citation needed] Mycobacterium tuberculosis group bacteria are 1.0-4.0 μm long by 0.2-0.3 μm wide in tissues. In culture, they may appear as cocci, or as bacilli up to 6-8 μm long. [citation needed]
Nodules and fibrotic scars may contain slowly multiplying tubercle bacilli with the potential for future progression to active tuberculosis. [1] Persons with these findings, if they have a positive tuberculin skin test reaction, should be considered high-priority candidates for treatment of latent infection regardless of age.
A bacillus (pl.: bacilli), also called a bacilliform bacterium or often just a rod (when the context makes the sense clear), is a rod-shaped bacterium or archaeon. Bacilli are found in many different taxonomic groups of bacteria. However, the name Bacillus, capitalized and italicized, refers to a specific genus of
diagram that shows how the bacteria from the form bacilli get to arrange. Date: 28 April 2006: Source: did it myself using adobe ilustrator based on the information found here ,,, and : Author: Mariana ruiz LadyofHats: Permission (Reusing this file) public domain: Other versions
English: Schematic diagram of cellular growth (elongation) and binary fission of bacilli. Blue and red lines indicate old and newly-generated bacterial cell wall, respectively. (1) growth at the center of bacterial body. e.g. Bacillus subtilis, E. coli, and so on. (2) apical growth. e.g. Corynebacterium diphtheriae.
Numerous rod shaped tuberculosis bacilli can be seen. There are several ways by which tuberculosis can infect the abdomen. The tubercle bacteria many enter the abdomen via the consumption of infected milk. Those with existing pulmonary tuberculosis can have abdominal tuberculosis through the ingestion of infected sputum. [2]