TABLE 1.

M. elsdenii tetracycline resistance genotypes determined by PCR analysesa

M. elsdenii strain(s)PCRbtet genotypec
123456
24-50; 26-50; 27-50; 28-50; 29-54; 30-54; 31-54; 32-54; 33-54No tet
Fern++ tet(O)
25-50; 29-55+ tet(W)
24-51; 25-51; 27-51; 28-53; 29-57; 30-55; 31-55; 33-57+ tet(OW)
24-53; 25-52; 26-51; 26-52; 27-52; 28-52; 30-56; 31-57; 32-56; 32-57; 33-56+++ tet(OWO)-2
  • a All M. elsdenii strains are swine fecal isolates except strain Fern, which was isolated from bovine rumen contents.

  • b “+”indicates product and “−” indicates no product for PCR depicted in Fig. 1.

  • c Additional tet genotypes were discovered upon sequencing tet(OW) and tet(W) genes, as described in the text.