TABLE 3.

MICs of tylosin for A. pyogenes strains with and without induction

Strainerm(X)aMIC of tylosin (μg/ml) following:
No inductionInduction with tylosin (1 μg/ml)
3+256>2,048
4+256>2,048
2977+>2,048>2,048
4759+128>2,048
14373-00-1+1,024>2,048
52789-99+8128
98-4277-2+2128
B167+128>2,048
E1DE+128>2,048
OX-1128128
OX-7128128
BBR1(pEP2)≤0.06NDb
BBR1(pJGS406)+64128
  • a Presence and absence of the erm(X) gene is denoted by + and −, respectively.

  • b Not determined, since BBR1(pEP2) will not grow on 1 μg of tylosin/ml.