Microbiology Quiz
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ANTIMICROBIALS AND RESISTANCE
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A laboratory's quality control supervisor notes that over a period of several weeks, all disk diffusion zone sizes for both E. coli ATCC 25922 and S. aureus ATCC 25923 are consistently trending towards the lower end of their acceptable ranges, with some results falling just below the limit. Inoculum density, disk potency, and incubation parameters have been verified as correct. Which of the following is the most probable cause for this systematic shift?
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