chemical denervation (Fig. 6). The nontoxin proteins mayprovide the toxin complex protection against temperature orenzymatic denaturation.16 Toxin type A, B, E, and rarely Fcause disease in human. Types C and D cause botulism inmammals and birds and type E can also cause botulism infish.17,18 Toxin type G is produced by a bacterial speciesdiscovered in South American soil in 1969, and it wasisolated from autopsy material from five patients inSwitzerland in 1977.19 Toxin type G has been associatedwith sudden death but not with neuroparalytic illness.