0.5 McFarland turbidity standard is used to standardize the inoculum for performing antimicrobial susceptibility test. Before antibiotic disks are placed on Muller Hinton agar plate, the bacterial suspension should be matched with the turbidity of 0.5 McFarland turbidity standard. It contains 1.5 X 108  CFU/ml of bacteria. Note: If we skip matching the turbidity of […]