size of zone of inhibition helps describe organisms as susceptible,
intermediate or resistant to drug
Commercial modifications of Susceptibility Testing→
are less labor intensive
and often offer faster results. Different systems in existence for example:
Small card with tiny wells containing specific antimicrobial concentrations
determined growth rate via turbidity in cards. Determined MICs in 615 hrs
a modification of disc diffusion test that uses a strip containing a
gradient of concentrations of an antimicrobial drug. The intersection of
zone of inhibition indicates MIC.
way to measure concentration of antimicrobial
drug in blood/body fluids. Can produce a standard curve and the
comparison can yield concentration.