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. 2011 Aug 10;119(11):1622–1628. doi: 10.1289/ehp.1003350

Table 3.

MIC range, MIC50, and MIC90 (µg/mL) for 17 antibiotics determined for E. faecalis and E. faecium recovered from conventional (CONV) and newly organic (ORG) poultry farms.

E. faecalis E. faecium
Antimicrobial Farm type MIC range MIC50 MIC90 MIC range MIC50 MIC90
CHL CONV 4 to ≥ 64 8 8 4 to 16 8 8
ORG 4 to 16 8 8 ≤ 2 to 8 8 8
CIP CONV 0.5 to 4 1 2 0.25 to ≥ 8 4 4
ORG 1 to ≥ 8 1 2 0.5 to ≥ 8 2 4
DAP CONV ≤ 0.5 to 4 1 1 ≤ 0.5 to 4 2 4
ORG ≤ 0.5 to 4 1 2 ≤ 0.5 to 4 2 4
ERY CONV ≤ 0.5 to ≥ 16 ≥ 16 ≥ 16 ≤ 0.5 to ≥ 16 1 8
ORG ≤ 0.5 to ≥ 16 1 ≥ 16 ≤ 0.5 to ≥ 16 2 4
FLAa CONV ≤ 1 to ≥ 32 2 8 2 to ≥ 32 ≥ 32 ≥ 32
ORG ≤ 1 to ≥ 32 ≤ 1 2 2 to ≥ 32 ≥ 32 ≥ 32
GEN CONV ≤ 128 to ≥ 2,048 ≤ 128 ≤ 128 ≤ 128 to ≥ 2,048 ≤ 128 1,024
ORG ≤ 128 ≤ 128 ≤ 128 ≤ 128 ≤ 128 ≤ 128
KAN CONV ≤ 128 to ≥ 2,048 ≤ 128 ≥ 2,048 ≤ 128 to ≥ 2,048 256 ≥ 2,048
ORG ≤ 128 to ≥ 2,048 ≤ 128 ≤ 128 ≤ 128 to ≥ 2,048 256 256
LINb CONV 16 to ≥ 64 ≥ 64 ≥ 64 ≤ 1 to ≥ 64 ≥ 64 ≥ 64
ORG 16 to ≥ 64 ≥ 64 ≥ 64 ≤ 1 to ≥ 64 16 ≥ 64
LZE CONV ≤ 0.5 to 2 1 2 1 to 4 2 2
ORG 1 to 4 2 4 1 to 4 2 4
NIT CONV 8 to ≥ 128 8 64 32 to ≥ 128 ≥ 128 ≥ 128
ORG 8 to ≥ 128 16 64 16 to ≥ 128 64 ≥ 128
PEN CONV 2 to ≥ 32 4 8 ≤ 0.5 to ≥ 32 16 ≥ 32
ORG 2 to 8 4 8 ≤ 0.5 to 16 4 8
STR CONV ≤ 512 to > 2,048 ≤ 512 2,048 ≤ 512 to > 2,048 ≤ 512 ≤ 512
ORG ≤ 512 to > 2,048 ≤ 512 1,024 ≤ 512 to > 2,048 ≤ 512 ≤ 512
SYNb CONV 2 to 32 4 16 ≤ 1 to 32 4 8
ORG 2 to 8 8 8 ≤ 1 to 16 2 4
TET CONV ≤ 4 to ≥ 64 ≥ 64 ≥ 64 ≤ 4 to ≥ 64 ≥ 64 ≥ 64
ORG 32 to ≥ 64 ≥ 64 ≥ 64 ≤ 4 to ≥ 64 ≤ 4 32
TIG CONV 0.03 to 0.5 0.12 0.25 0.06 to 0.5 0.12 0.25
ORG 0.06 to 0.25 0.25 0.25 0.03 to 0.25 0.12 0.25
TYL CONV 1 to ≥ 64 ≥ 64 ≥ 64 1 to ≥ 64 4 ≥ 64
ORG 1 to ≥ 64 4 ≥ 64 2 to 16 4 8
VAN CONV ≤ 0.5 to 4 1 2 ≤ 0.5 to 2 ≤ 0.5 1
ORG 1 to 4 1 2 ≤ 0.5 to 4 1 2
aE. faecium is intrinsically resistant to FLA. bE. faecalis is intrinsically resistant to LIN and streptogramin A (dalfopristin).