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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Escherichia coli >1 >8 0.5 － >8 Tetracycline (Sumycin, Achromycin V, Steclin) 462
Escherichia coli >2 >8 ≤2 － >8 Tetracycline (Sumycin, Achromycin V, Steclin) 472
Escherichia coli 64 256 0.125 － >512 Tetracycline (Sumycin, Achromycin V, Steclin) 436
Escherichia coli - - 0.25 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 990
Escherichia coli - - 1 － 128 Tetracycline (Sumycin, Achromycin V, Steclin) 873
Escherichia coli - - 1 － >128 Tetracycline (Sumycin, Achromycin V, Steclin) 917
Escherichia coli - - 3.12 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 320
Escherichia coli - - 4 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 164
Escherichia coli - - 12.5 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 64
Escherichia coli - - 25 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 968
Escherichia coli - - 29.76 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 1190
Escherichia coli - - >50 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 1135
Escherichia coli - - >128 － ? Tetracycline (Sumycin, Achromycin V, Steclin) 1002