<prompt> Growth of C diphtheriae in Tellurite agar occurs in -2-4 hours4-8 hours8-12 hours1-2 days  <response>: Ans. is d i.e., 1-2 days The usual media employed for cultivation of diphtheria bacillus are:-1 Loefflers serum slope It is used for rapid diagnosis as growth is shown within 4-8 hours.2 Tellurite blood agar Tinsdale medium It acts as selective media, as tellurite inhibits growth of most other bacteria. Growth may take two days to appear. 