Microbiology Which of the following is true about Corynebacterium diphtheriae? A Loeffler's serum is highly selective media for C. diphtheriae B Elek gel is a precipitation test C Gram negative bacilli, non-motile, non capsulated D Metachromatic granules is produced on stain only by one strain of C. diphtheriae 💡 Explanation Which of the following is true about Corynebacterium diphtheriae? ✓ Correct Answer: B. Elek gel is a precipitation test