The CBIC Certified Infection Control Exam Study Guide (6th edition) emphasizes that certain organisms commonly recovered from blood cultures—such as Arcanobacterium, coagulase-negative Staphylococcus, and Corynebacterium—are frequently associated with skin contamination rather than true bloodstream infection. When multiple blood cultures yield these organisms, the infection preventionist must assess whether the findings represent contamination related to collection practices rather than immediately assuming infection or outbreak.
The most appropriate action is to collaborate with the laboratory manager and clinical teams to evaluate potential trends, specimen collection techniques, and changes in practice. This includes reviewing blood culture contamination rates, assessing skin antisepsis procedures, evaluating staff competency, and determining whether there has been an increase associated with a specific unit, shift, or collection method. Surveillance data and laboratory quality indicators are essential tools in this evaluation.
Option A is incorrect because results should never be disregarded without assessment. Option B is premature, as the organisms listed are not typical outbreak pathogens and require further analysis before escalation. Option C is inappropriate because these organisms do not automatically meet criteria for healthcare-associated bloodstream infection without supporting clinical evidence.
This scenario reflects a core CIC® exam concept: infection preventionists must apply epidemiologic principles, collaborate with laboratory services, and use data-driven analysis to differentiate contamination from infection and to guide quality improvement efforts.
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