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Two pairs of air culture blood agar plates for G(+) bacteria and MacConkey agar plates for G(-) bacteria were placed at surgical field, under the airflow of local air conditioner and pathway for indirect participants (total 12 plates). S1, operator; S2, 1st assistant; S3, 2nd assistant; N, scrub nurse; A, anesthesiologist. a)blood agar plate, b)MacConkey agar plate.
