<prompt> A 12 year old child presents with fever and cervical lymphadenopathy. Oral examination shows a grey membrane on the right tonsil extending to the anterior pillar. Which of the following medium will be ideal for the culture of the throat swab for rapid identification of the pathogen?Nutrient agarBlood agarLoefflers serum slopeLJ medium  <response>: The symptoms of the given case are suggestive of C. diphtheria infection.On Loefflers serum slope, C. diphtheriae grows after 46 hours at 37C producing small, circular, and white opaque colonies. If no colonies are seen, the medium is reincubated further for 24 hours.Parija SC. Textbook of Microbiology Immunology. Elsevier Health Sciences; 2014. Page:218 