B. cereus produces spores rapidly in normal conditions. The structure of the elongated subterminal spore (figure 3), which does not swell the sporangium, is similar to that of other bacilli, where the core is surrounded by the inner membrane, cortex, inner coat and outer coat [27]. This bacterial form has no metabolic activity and spores are relatively resistant to extreme environmental conditions such as heating, freezing, drying and radiation. Spores are important for the spreading of B. cereus, and in some strains they are known to adhere to human epithelial cells, which has been thought to be an additional virulence mechanism [28]. In addition, spore antigens confer high specificity, although cross-agglutination has been found between B. thuringiensis and B. cereus as well as between B. anthracis and B. cereus [29]. The germination of spores and the initiation of sporangial growth is very much dependent on suitable environmental conditions.
B. cereus produces spores rapidly in normal conditions. The structure of the elongated subterminal spore (figure 3), which does not swell the sporangium, is similar to that of other bacilli, where the core is surrounded by the inner membrane, cortex, inner coat and outer coat [27]. This bacterial form has no metabolic activity and spores are relatively resistant to extreme environmental conditions such as heating, freezing, drying and radiation. Spores are important for the spreading of B. cereus, and in some strains they are known to adhere to human epithelial cells, which has been thought to be an additional virulence mechanism [28]. In addition, spore antigens confer high specificity, although cross-agglutination has been found between B. thuringiensis and B. cereus as well as between B. anthracis and B. cereus [29]. The germination of spores and the initiation of sporangial growth is very much dependent on suitable environmental conditions.
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