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After Clostridium botulinum type G organisms and toxin were identified in necropsy specimens in cases of unexplained death in adults and infants (O. Sonnabend, W. Sonnabend, R. Heinzle, T. Sigrist, R Dirnhofer, and U. Krech, J. Infect. Dis. 143:22-27, 1981), extensive research to detect C. botulinum type G in soil samples from Switzerland was done. A total of 41 specimens from virgin soil and from cultivated land were examined for the presence of C. botulinum type G and other toxin types. Because of the lack of the lipase marker in type G, the detection of C. botulinum type G was based on the demonstration of type G organisms in enrichment cultures by a type G-specific enzyme-linked immunosorbent assay to detect both the type G toxin and antigen; enrichment cultures in which type G toxin or antigen was identified by enzyme-linked immunosorbent assay were then tested by a type G-specific gel immunodiffusion agar procedure. This method not only isolated strains of type G but also strains of Clostridium subterminale, a nontoxigenic variant of C. botulinum type G. As a consequence of the observed cross-reactions caused by strains of C. subterminale within this test system, all isolates of type G had to be definitively confirmed by mouse bioassay. The sequential steps of these methods seem to be very useful for detecting C. botulinum type G organisms. C. botulinum type G strains were isolated in five soil samples from different locations in close association with cultivated land.(ABSTRACT TRUNCATED AT 250 WORDS)

Isolation of Clostridium botulinum type G from Swiss soil specimens by using sequential steps in an identification scheme