Dual Toxin-Producing Strain of Clostridium botulinum Type Bf Isolated from a California Patient with Infant Botulism

Abstract
A retrospective study of Clostridium botulinum strains isolated from patients from California with infant botulism identified the fourth known C. botulinum strain that produces both type B and type F botulinum toxins. This unique strain represented 0.12% of the California infant botulism case isolates from 1976 to 2003. The relative concentrations of type B and F toxins produced were temperature dependent.

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