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Table 7 The growth of resistant strains after exposed to different concentrations of tylosin

From: Pharmacokinetic-pharmacodynamic modeling of tylosin against Streptococcus suis in pigs

Concentrations (μg/mL) Time(h)
0 2 4 8 12 24
0 + + + ++ ++ +
0.125 + + + + ++ ++
0.25 + + + + ++ ++
0.5 + + + ++ ++ +
1 + + + + + +
2 + + + + N N
4 + + N N N N
8 + + N N N N
  1. N, colony number below 10 cfu/mL; +, colony number between 10 and 1000 cfu/mL; ++, colony number beyond 1000 cfu/mL