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Morphology of purified Clostridium botulinum spores. (A) Typical morphologies of Group I strains and Group II Eklund 17B, (B) Group II Beluga, and (C) Group III strains, presenting: Cr, core; Cx, cortex; Co, coat; Exp, exosporium; and App, appendages. (D) Electron micrographs of thin sections of purified spores from ATCC 3502, ATCC 19397, UN1/10-7B, ATCC 17841, UN5/11-8, Eklund 17B, Beluga, Stockholm C, and BKT015925.
