<prompt> String of pearl appearance is seen in:-ClostridiumBacillus anthracisPneumococcusStaph. aureus  <response>: 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 microscopeRefer to the image below. Gelatin stab: Appear as inveed fir tree appearanceRefer to the image below. Solid media with penicillin:String of pearl appearance in culture smear. Selective medium: PLET medium. 