Table 2.

Susceptibility of E. faecium and E. faecalis strains from farm animals and pets

Antibiotic and host originE. faeciumE. faecalis
MIC50aMIC90aRangea% SusceptibleMIC50aMIC90aRangea% Susceptible
Flavomycin
 Broilers128>2568–>256NAb 0.250.50.12–2NA
 Swine>256>25632–>256NA0.250.50.12–1NA
 Ruminants>256>256128–>256NA 0.120.250.12–0.25NA
 Pet, avian>256>256128–>256NA 0.250.50.25–0.5NA
 Pet, mammalian>256>256256–>256NA 0.250.50.12–1NA
Avoparcin
 Broilers140.5–64NA 120.5–2NA
 Swine120.5–2NA 120.5–2NA
 Ruminants110.5–64NA 240.5–4NA
 Pet, avian120.5–2NA 140.5–4NA
 Pet, mammalian141–64NA 120.5–4NA
Monensin
 Broilers480.12–4NA 481–8NA
 Swine480.12–4NA 482–8NA
 Ruminants280.12–4NA 882–8NA
 Pet, avian280.12–4NA 482–8NA
 Pet, mammalian880.12–4NA 881–8NA
Narasin
 Broilers240.12–4NA 0.2520.06–4NA
 Swine0.2520.06–8NA 0.250.250.06–4NA
 Ruminants0.250.250.12–0.25NA 0.250.250.06–2NA
 Pet, avian0.250.250.06–0.5NA 0.250.250.06–2NA
 Pet, mammalian0.120.250.06–1NA 0.250.250.06–2NA
Avilamycin
 Broilers0.5320.12–>256NA 0.510.12–32NA
 Swine0.5160.25–>256NA 0.510.25–32NA
 Ruminants0.250.250.25–1NA 110.25–1NA
 Pet, avian0.510.25–1NA 0.510.25–>256NA
 Pet, mammalian0.250.50.25–1NA 110.25–1NA
Virginiamycin
 Broilers32640.5–64NA 4161–32NA
 Swine280.5–32NA 4162–32NA
 Ruminants110.25–8NA 240.5–4NA
 Pet, avian0.510.25–4NA 442–8NA
 Pet, mammalian0.520.25–16NA 441–8NA
Bacitracina
 Broilers322562–256NA 64>2560.5–>256NA
 Swine41280.12–>256NA 482–>256NA
 Ruminants2162–16NA 42561–>256NA
 Pet, avian480.5–128NA 42561–>256NA
 Pet, mammalian8640.5–128NA 481–256NA
Tylosin
 Broilers32>2561–>2561832>2560.5–>25646
 Swine256>2560.5–>25618256>2562–>25614
 Ruminants>256>2561–>25620>256>2561–>25648
 Pet, avian21280.5–>256862>2561–>25659
 Pet, mammalian2>2561–>256575>2561–>25658
Ampicillin
 Broilers140.06–3294120.25–2100
 Swine180.12–12894140.12–8100
 Ruminants441–3280221–2100
 Pet, avian140.12–4100241–8100
 Pet, mammalian21280.25–12874220.06–4100
Oxytetracycline
 Broilers64>2560.12–>2568>2560.25–>25621
 Swine128>2560.25–>2563>2568–>2560
 Ruminants>256>2560.5–>256202560.5–>25629
 Pet, avian0.51280.25–>128692560.5–>25629
 Pet, mammalian161280.25–>256472560.5–25630
Enrofloxacin
 Broilers480.5–8NA 120.25–8NA
 Swine280.5–16NA 0.510.25–2NA
 Ruminants480.5–8NA 0.5160.25–64NA
 Pet, avian180.5–16NA 240.5–8NA
 Pet, mammalian281–8NA 110.12–32NA
Streptomycin
 Broilers<500>2,000<500–>2,00088<500>2,000<500–>2,00074
 Swine1,000>2,000<500–>2,000792,000>2,000<500–>2,00053
 Ruminants<5001,000<5001001,000>2,000<500–>2,00088
 Pet, avian<5001,000<500–>2,00095<5001,000<500–>2,00097
 Pet, mammalian<500>2,000<500–>2,00080>500>2,000<500–>2,00082
Gentamicin
 Broilers<500<500<500–2,00097<500<500<500100
 Swine<5002,000<500–2,00079<5002,000<500–>2,00075
 Ruminants<500<500<500–2,00090<5002,000<500–>2,00072
 Pet, avian<500<500<500–>2,00093<5002,000<500–2,00070
 Pet, mammalian<500<500<500–>2,00093<5002,000<500–>2,00088
  • a Micrograms per milliliter. Bacitracin MICs are in international units per milliliter.

  • b NA, not applicable (no NCCLS breakpoint available).