Patent ID: 8753875

Claim:
A platform comprising a solid support that comprises six or more separate compartments, each compartment comprising a test composition or a control composition, wherein i) said test composition comprises a semi solid microbial growth medium, an antibacterial antibiotic, and three or more chromogenic substrates selected from the group consisting of 5-Bromo-6-chloro-3-indolyl phosphate p-toluidine, 5-Bromo-4-chloro-3-indolyl-β-D-galactopyranoside, 5-Bromo-6-chloro-3-indolyl-β-D-galactopyranoside, 6-Chloro-3-indolyl-β-D-galactopyranoside, 5-Bromo-4-chloro-3-indolyl-β-D-glucopyranoside, and 5-Bromo-4-chloro-3-indolyl-β-D-glucuronide; ii) at least five of said compartments comprise test compositions, each test composition differing from the others by comprising a different antibacterial antibiotic; iii) at least one of said compartments comprises a control composition; said control composition comprises the same semi solid microbial growth medium and the same chromogenic substrates as said test composition, but does not comprise an antibacterial antibiotic as defined in i); and wherein said semi solid microbial growth medium comprises tryptophan.