<prompt> A child presents with a white patch over the tonsils; diagnosis is made by culture in :Loeffler mediumLJ mediumBlood agarTellurite medium  <response>: In a child white patch over tonsils, probable diagnosis is of Diphtheria.Culture media for corynebacterium are :i. Loefflers serum slope : Growth is very rapid and colonies seen in 6-8 hrs, before other bacteria grows. Itis also used for M. tuberculosis. Diptheria is emergency condition, so Loefflers slope is prefered media in this child.ii. Tellurite blood agar media : Selective media but growth is delayed and may take about 2 days to appear.Remember :LJ media, is for Mycobacteria TB.Mcleods and Hoyles are modified Tellurite media.Blood agar is used to differentiate Staph. and Sterpt. pharyngitis. 