Polymyxin-B-SD139-5x50DS is referred as Polymyxin B PB 100 units disc under Hi Media catalogue. Each pack of Polymyxin-B-SD139-5x50DS contains 5 vials of 50 discs. Each filter paper disc of Polymyxin-B-SD139-5x50DS is of 6mm diameter with printed "PB 100" on centre of each side of the disc. Each Polymyxin-B-SD139-5x50DS disc is saturated with 100 units Polymyxin-B.

Polymyxin-B discs are used for antimicrobial susceptibilty test of bacteria using Bauer-Kirby Method. Generally Mueller Hinton Agar (M173/M1084) medium is used for susceptibility test.The susceptibility test is determined on the basis of zone of inhibition. The cultural response can be obeserved after incubating the standard culture at 35-37C for 18 hrs.

Storage and shelf life: It is advised to store the discs always at -20C after opening. The disc loses its stability at higher temperature (45C).