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Clinical test area with trypticase soy agar with 5% sheep blood plates placed in zone 1 (red; horizontal distance, < 2.0 feet; vertical distance, ≈ 3.0 feet); zone 2 (blue; horizontal distance, 2.0-4.0 feet; vertical distance, 3.0 feet); and zone 3 (yellow, horizontal distance, > 4.0 feet; vertical distance, 5.0 feet).
