 In fact , from the evolutionary point of view , the members of genus Shigella ( S. <unk> , S. <unk> , S. <unk> , and S. <unk> ) should be classified as E. coli strains , a phenomenon termed taxa in disguise . Similarly , other strains of E. coli ( e.g. the K @-@ 12 strain commonly used in recombinant DNA work ) are sufficiently different that they would merit reclassification . 
