Corynebacterium diphtheriae
Corynebacterium diphtheriae C. diphtheriae is an aerobic gram-positive rod-shaped non-spore forming bacteria. here we are going to discuss some of the features of this bacteria. CHARACTERISTICS >As previously stated its a gram-positive rod >aerobic > non-spore forming >swelling near the pole giving it club like structure >contains granules that can be stained >no perfect branching is seen under a microscope >destroy epithelial cells and form pseudomembrane on the throat, larynx, and pharynx region COLONY CHARACTERISTICS greyish color colonies grow on blood agar, the colonies are granular with an uneven edge with little hemolysis. on Tinsdale medium brown or black color, colonies grow due to potassium tellurite. STAINING aniline dyes are used to stain the granules. PATHOGENESIS generally, these bacteria are harmless but upon infection with a lysogenic beta phage, these bacteria converted to toxigenic bacteria. the gene responsible for toxin p...