CORYNEBACTERIUM DIPHTHERIAE
Organism Gram Morphology Culture Staining Biochemical Pathogene
+ve & Media Properties
Gram -
ve
Corynebacterium Gram Club- Löffler’s Albert's Ferments Diphtheria
diphtheriae positive shaped serum staining glucose &
bacilli medium maltose (no Produce
Metachromatic gas) diphtheria
Pleomorphic Tellurite granules
arrangement blood agar Catalase inhibits pro
in Chinese +ve synthesis
letters
Urease -ve Cell death
Non-motile
H₂S +ve Pseudome
Non-spore formation
forming
SHIGELLA
Organism Gram Morphology Culture Staining Biochemical Pathogene
+ve and Media Properties
Gram -
ve
Shigella Gram Non-motile Nutrient agar Gram staining Does not Bacillary
dysenteriae negative ferment dysentery
Non-spore Blood agar lactose
Shigella sonnei forming (except Invades int
MacConkey Shigella mucosa
Shigella boydii Facultative agar sonnei late)
anaerobe Shiga toxin
Organism Gram Morphology Culture Staining Biochemical Pathogene
+ve & Media Properties
Gram -
ve
Corynebacterium Gram Club- Löffler’s Albert's Ferments Diphtheria
diphtheriae positive shaped serum staining glucose &
bacilli medium maltose (no Produce
Metachromatic gas) diphtheria
Pleomorphic Tellurite granules
arrangement blood agar Catalase inhibits pro
in Chinese +ve synthesis
letters
Urease -ve Cell death
Non-motile
H₂S +ve Pseudome
Non-spore formation
forming
SHIGELLA
Organism Gram Morphology Culture Staining Biochemical Pathogene
+ve and Media Properties
Gram -
ve
Shigella Gram Non-motile Nutrient agar Gram staining Does not Bacillary
dysenteriae negative ferment dysentery
Non-spore Blood agar lactose
Shigella sonnei forming (except Invades int
MacConkey Shigella mucosa
Shigella boydii Facultative agar sonnei late)
anaerobe Shiga toxin
