(A) Toxigenic strains of E. coli
(B) Toxigenic strains of Clostridium tetani
(C) Non-toxigenic strains of Clostridium tetani
(D) Non-toxigenic strains of Proteus
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(A) Toxigenic strains of E. coli
(B) Toxigenic strains of Clostridium tetani
(C) Non-toxigenic strains of Clostridium tetani
(D) Non-toxigenic strains of Proteus