The CBIC Certified Infection Control Exam Study Guide (6th edition) clearly states that the correct and recommended method for obtaining urine cultures in patients with an indwelling urinary catheter is to collect the specimen using aseptic technique from the catheter's designated sampling (collection) port. This method minimizes the risk of contamination and provides the most accurate reflection of organisms present in the urinary tract.
Urine collected from the sampling port is obtained after disinfecting the port and aspirating urine with a sterile syringe. This approach maintains the integrity of the closed drainage system and reduces the introduction of microorganisms. Accurate culture collection is essential for correct diagnosis of catheter-associated urinary tract infection (CAUTI) and for distinguishing true infection from colonization or contamination.
Option B is incorrect because culturing the catheter tip is not recommended for diagnosing CAUTI; it does not reliably represent urinary tract pathogens and may reflect biofilm colonization. Option C is inappropriate because disconnecting the catheter from the drainage tubing breaks the closed system and increases infection risk. Option D is incorrect because urine from the drainage bag is often contaminated and does not accurately represent bladder urine.
For CIC exam preparation, it is critical to recognize that aseptic aspiration from the catheter sampling port is the standard of care for urine culture collection in catheterized patients and is a core infection prevention principle related to CAUTI surveillance and diagnosis.

Measures of central tendency (mean, median, mode) and dispersion (standard deviation) are statistical tools used to summarize data, such as the duration of surgical procedures, which can help infection preventionists identify trends or risks for surgical site infections. The Certification Board of Infection Control and Epidemiology (CBIC) supports the use of data analysis in the "Surveillance and Epidemiologic Investigation" domain, aligning with epidemiological principles outlined by the Centers for Disease Control and Prevention (CDC). The question provides a data set of 2, 2, 3, 4, and 9, and requires determining the correct statement by calculating these measures.
Mean: The mean is the average of the data set, calculated by summing all values and dividing by the number of observations. For the data set 2, 2, 3, 4, and 9:(2 + 2 + 3 + 4 + 9) ÷ 5 = 20 ÷ 5 = 4. Thus, the mean is 4, making Option C correct.
Median: The median is the middle value when the data set is ordered. With five values (2, 2, 3, 4, 9), the middle value is the third number, which is 3. Option A states the median is 2, which is incorrect.
Mode: The mode is the most frequently occurring value. In this data set, 2 appears twice, while 3, 4, and 9 appear once each, making 2 the mode. Option B states the mode is 3, which is incorrect.
Standard Deviation: The standard deviation measures the spread of data around the mean. For a small data set like this, the calculation involves finding the variance (average of squared differences from the mean) and taking the square root. The mean is 4, so the deviations are: (2-4)² = 4, (2-4)² = 4, (3-4)² = 1, (4-4)² = 0, (9-4)²
= 25. The sum of squared deviations is 4 + 4 + 1 + 0 + 25 = 34. The variance is 34 ÷ 5 = 6.8, and the standard deviation is #6.8 # 2.61 (not 7). Option D states the standard deviation is 7, which is incorrect without further context (e.g., a population standard deviation with n-1 denominator would be #34 # 5.83, still not 7).
The CBIC Practice Analysis (2022) and CDC guidelines encourage accurate statistical analysis to inform infection control decisions, such as assessing surgical duration as a risk factor for infections. Based on the calculations, the mean of 4 is the only correct statement among the options, confirming Option C as the answer. Note that the standard deviation of 7 might reflect a miscalculation or misinterpretation (e.g., using a different formula or data set), but with the given data, it does not hold.
References:
CBIC Practice Analysis, 2022.
CDC Principles of Epidemiology in Public Health Practice, 3rd Edition, 2012.

The CBIC Certified Infection Control Exam Study Guide (6th edition) defines prophylactic antimicrobial therapy as the use of antibiotics to prevent infection in the absence of clinical signs or symptoms of active disease. In this scenario, the patient has a history of Clostridioides difficile infection but is currently asymptomatic for diarrhea or other CDI manifestations. The antibiotic is therefore not being used to treat active infection.
Empiric therapy (Option A) is initiated when infection is suspected but the causative organism has not yet been identified-this does not apply here, as the patient has no symptoms suggesting infection. Targeted therapy (Option D) requires laboratory confirmation of a specific pathogen, which is also not present. While prescribing antibiotics in patients with prior CDI may be clinically questionable depending on indication and stewardship principles, the type of therapy being applied is best categorized as prophylactic, not inappropriate, based on standard antimicrobial definitions.
The Study Guide emphasizes that antimicrobial stewardship programs carefully evaluate prophylactic antibiotic use because unnecessary exposure can disrupt normal flora and increase the risk of CDI recurrence.
However, from a classification standpoint, antibiotics given without signs of active infection fall under prophylactic use.
For CIC exam preparation, it is important to correctly identify antimicrobial intent, even when clinical appropriateness may be debatable.

The Certification Study Guide (6th edition) stresses that education alone is insufficient to ensure sustained adherence to infection prevention practices. While lectures and demonstrations are valuable for knowledge dissemination, they do not guarantee consistent behavioral compliance over time. In this scenario, the occurrence of a CRE outbreak three months after education indicates a gap between knowledge and practice.
To minimize the risk of a subsequent outbreak, the most effective strategy is directly assessing staff compliance with isolation precautions, which is best accomplished by engaging managers and leadership. The study guide emphasizes the importance of monitoring, auditing, and feedback as core components of an effective infection prevention program. Managers are uniquely positioned to observe daily practice, reinforce expectations, and hold staff accountable for adherence to standard and transmission-based precautions.
The other options focus primarily on educational reinforcement rather than practice validation. Updating content, testing knowledge, or offering recorded lectures may improve awareness but do not address whether staff are actually implementing precautions correctly at the point of care. CRE transmission is most often linked to failures in hand hygiene, contact precautions, and environmental cleaning-issues that require ongoing observation and performance management, not passive education.
This question reflects a common CIC exam theme: preventing outbreaks requires behavioral verification and leadership engagement, not education alone. By assessing and reinforcing compliance through managers, the infection preventionist addresses the root cause of transmission risk and supports sustainable prevention.
Reference: Certification Study Guide (CBIC/CIC Exam Study Guide), 6th edition, Chapter 7: Management and Communication; Chapter 8: Education and Research.