Earliest growth of diphtheria is detect on which media ?
Potassium tellurite media with iron
McConkey's agar
Dorset egg medium
Loeffler's serum slope
Ans. is 'd' i.e., Loeffler's serum slope Diphtheria bacilli grow on Loeffler's serum slope very rapidly and colonies can be seen in 6-8 hours, long before other bacteria grow.