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Recovery of a strain of Clostridium botulinum producing both neurotoxin A and neurotoxin B from canned macrobiotic food

A rare strain of Clostridium botulinum subtype Ab was isolated from a canned macrobiotic food suspected of being linked to a fatal case of food-borne botulism. The strain was recovered and identified by conventional methods modified by the inclusion of a PCR assay (G. Franciosa, J.L. Ferreira, and C.L. Hatheway, J. Clin. Microbiol. 32:1911-1917, 1994). The titers of neurotoxins produced by the strain were evaluated by a mouse bioassay.