A child presents with a white patch over the tonsils, diagnosis is best made by culture in
White patch over the tonsil is suggestive of infection with cCorynebacteriumdiphtheriae. It can be confirmed by culture in Tellurite blood agar. Tellurite inhibits the growth of most other bacteria acting as a selective agent for diphtheria bacilli. Diphtheria bacilli reduce Tellurite to metallic tellurium which incorporates into colonies giving them a grey or black color. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 242
Loeffler medium
LJ medium
Blood agar
Tellurite medium
Bacteriology