You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is true about Corynebacterium diphtheriae? and explain in detail?
Elek gel is a precipitation test. - Loeffler's serum slope is an Enriched medium. - Selective medium for C. diphtheriae is tellurite blood agar (eg. Mc Leod's and Hoyle's media or cystine - tellurite agar - Tinsdale medium). - Elek's gel is a precipitation test. It is an in vitro test for toxigenicity of the diphtheria bacillus. (Refer to the image below) - C. diphtheriae is gram positive, non-motile and non-capsulated, pleomorphic, non-sporing, slender rod- shaped bacilli. - All strains of C. diphtheriae show metachromatic granules on staining. Granules are composed of polymetaphosphate. Albe's stain is used to demonstrate Volutin/Metachromatic/Babes Ernst granules of Corynebacterium diphtheriae. It contains toluidine blue 'O' and malachite green. The bacilli are usually arranged in Chinese letter or cuneiform arrangement. Other stains : Neisser's stain, Ponder's stain.