Previous studies have documented usefulness of PCR in genotyping C perfringens. The multiplex assay is as effective, but simpler, and may be a useful alternative to standard in vivo typing methods. Results of genotyping of field isolates suggested the need for further epidemiologic study of clostridial enteritis, particularly as this pertains to predominant etiologic toxin types, and documented the presence of the reportedly rare genotypes B and E.