<prompt> A child come with fever, cold, cough, membrane over tonsils; nasal swab is taken, culture should be done on which medium for earliest diagnosis ?Loffelers serum slopL. J. mediaMC Conkeys AgarCitrate media  <response>: Ans. is a i.e., Loffelers serum slop Diphtheria bacilli grow on Loefflers serum slope very rapidly and colonies can be seen in 6-8 hours, long before other bacteria grow. 