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For the detection of urease production by Proteus spp. A sterile solution of 40% urea, for addition to Urea Broth Base (LAB131) and Urea Agar Base (LAB130).

A sterile solution of 3.5% potassium tellurite. A selective agent for addition to Hoyles's medium (LAB027), for the selective isolation and differentiation of Corynebacterium diphtheriae.

Potassium Tellurite Solution for use with Modified Giolitti and Cantoni Broth (ISO) LAB219 for the detection and enumeration of coagulase-positive staphylococci.