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Plasmid profiling (A) and Southern blot hybridization (B) of DHA-1-positive enteric microbes of human and farm origin. Lane M, 1-kb marker; lane 1, E. coli (swine isolate); lane 2, S. Montevideo (human isolate); lane 3, K. pneumoniae (swine isolate); lanes 4 and 5, K. pneumoniae (human isolates); lanes 6, 7, and 8, S. Indiana (poultry isolates); lane 9, S. Agona (poultry isolates, negative control).
