String of pearl appearance is seen in:-
Correct Answer: Bacillus anthracis
Description: String of pearl appearance is seen in Bacillus anthracis. Laboratory Diagnosis of Anthrax: McFadyean reaction: Polypeptide capsule is seen as amorphous purple material surrounding blue bacilli when stained with polychrome methylene blue. Gram staining: chain of bacilli arranged in bamboo stick appearance (Refer to the image below). On Agar plate: Medusa head appearance colony (under low power microscope)(Refer to the image below). Gelatin stab: Appear as inveed fir tree appearance(Refer to the image below). Solid media with penicillin:String of pearl appearance in culture smear. Selective medium: PLET medium.
Category:
Microbiology
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