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Table 3 Combined antimicrobial effect (FIC index) of the Natto peptide and other antimicrobial agents

From: Novel antimicrobial activities of a peptide derived from a Japanese soybean fermented food, Natto, against Streptococcus pneumoniae and Bacillus subtilis group strains

Antibiotic FIC index
Amoxicillin 2
Cefditoren 2
Tebipenem 2
Levofloxacin 2
Clarithromycin 1.38
Amikacin 1.09
Tobramycin 2
Gentamicin 2