Growth of C diphtheriae in Tellurite agar occurs in -: (A) 2-4 hours, (B) 4-8 hours, (C) 8-12 hours, (D) 1-2 days
Answer is D. Ans. is 'd' i.e., 1-2 days * The usual media employed for cultivation of diphtheria bacillus are:-1) Loeffler's 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.