Colistin Disk

Confirm Gram-stain reaction of anaerobes and presumptively identify anaerobic, Gram-negative bacilli with Thermo Scientific™ Remel™ Colistin Disk.

In 1971 Sutter and Finegold¹ recommended a method to identify anaerobic, Gram-negative bacilli based on the difference in response to an antibiotic. Accordingly, organisms can be grouped based on their characteristic inhibitory patterns with erythromycin, rifampin, colistin, penicillin, kanamycin and vancomycin^2,3.

Confirm Gram-stain reactions of anaerobes and presumptively identify anaerobic, Gram-negative bacilli with Colistin Disks.

• Ready to use: Colistin-impregnated disk.
• Easy to interpret: Sensitive organisms exhibit an inhibitory zone greater than 10 mm around the antibiotic disk while resistant organism exhibit no inhibitory zone i.e., a zone that is less than 10 mm around the disk.

Colistin Disk contains 10 μg colistin.

Disks impregnated with erythromycin, rifampin, colistin, penicillin, kanamycin and vancomycin can be used to identify anaerobic, Gram-negative bacilli based on the zone of inhibition they exhibit. Colistin and vancomycin confirm the Gram-stain reaction, which is helpful with Clostridia that stain Gram-negative. Penicillin, rifampin and kanamycin separate Bacteroides and Fusobacterium.