Dr. Amel Yacoubi

 On Gram staining: Gram positive cocci in groups (Figure n°1)  On blood agar: beta hemolysis (complete hemolysis) (Figure n°2)  On Mannitol salt agar : fermentation of mannitol (yellow color) (Figure n°3)  Coagulase test: positive (Figure n°4)  Organism: Staphylococcus aureus

(Figure n°1) (Figure n°2) (Figure n°3) (Figure n°4)

 Microscopic : Gram negative rods (Figure n°5)  Culture on Mac conkey agar:  Lactose fermenting (LF) colonies (pink colonies) (Figure n°6)  Ex: E.coli  Non Lactose fermenting (NLF) (Figure n°7 )  Ex: Salmonella – Shigella

(Figure n°5) (Figure n°6) (Figure n°7)

 TCBS agar  Use: selective medium of Vibrio cholorae (Figure n°8 ).  Growth: V. cholorae gives yellow colonies due to fermentation of sucrose. Others vibrios give pale colonies because they not ferment sucrose (Figure n°9 ).

(Figure n°8)(Figure n°9)

 Station 4:  Gram positive bacilli showing endospores (Figure n°10)  Ex: Bacillus anthracis (Figure n°10)

 Gram positive rods with variable staining (Figure n°11 )  Ex: Clostridium perfringens  Culture on Robertson cooked meat: Anaerobic medium used for isolation of Cl. Perfringens and others anaerobic bacteria.  The color turned orange due to the saccharolytic activity of organism (Figure n°12).

(Figure n°11) (Figure n°12)

 Station 6:   Anaerobic jar (Figure n° 13) (Figure n°13) Anaerobic Gas Pack