利用CIC考題 -跟CBIC Certified Infection Control Exam考試困擾說再見

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最新的 Infection Control CIC 免費考試真題 (Q56-Q61):

問題 #56
Following an outbreak of Hepatitis A, the water supply is sampled. A high count of which of the following isolates would indicate that the water was a potential source?

答案：C

解題說明：
Coliform bacteria are indicators of fecal contamination in water, making them a critical measure of water safety. Hepatitis A is a virus primarily transmitted via the fecal-oral route, often through contaminated food or water.
Step-by-Step Justification:
* Fecal Contamination and Hepatitis A:
* Hepatitis A virus (HAV) spreads through ingestion of water contaminated with fecal matter. High coliform counts indicate fecal contamination and increase the risk of HAV outbreaks.
* Use of Coliforms as Indicators:
* Public health agencies use total coliforms and Escherichia coli (E. coli) as primary indicators of water safety because they signal fecal pollution.
* Waterborne Transmission of Hepatitis A:
* Hepatitis A outbreaks have been traced to contaminated drinking water, ice, and improperly treated wastewater. Coliform detection signals a need for immediate action.
Why Other Options Are Incorrect:
* B. Pseudomonads:
* Pseudomonads (e.g., Pseudomonas aeruginosa) are environmental bacteria but are not indicators of fecal contamination.
* C. Legionella:
* Legionella species cause Legionnaires' disease through inhalation of contaminated aerosols, not through fecal-oral transmission.
* D. Acinetobacter:
* Acinetobacter species are opportunistic pathogens in healthcare settings but are not indicators of waterborne fecal contamination.
CBIC Infection Control References:
* APIC Text, "Water Systems and Infection Control Measures".
* APIC Text, "Hepatitis A Transmission and Waterborne Outbreaks".


問題 #57
A healthy long-term employee with a history of Bacillus Calmette-Guerin (BCG) vaccination has a Tuberculin Skin Test (TST) result of 7 mm induration. The current Centers for Disease Control and Prevention (CDC) recommendations include which of the following?

答案：B

解題說明：
The CBIC Certified Infection Control Exam Study Guide (6th edition) aligns with CDC guidance regarding interpretation of the tuberculin skin test (TST) in healthcare personnel. For a healthy individual with no known risk factors for tuberculosis, a TST is considered positive only when induration is #10 mm. In this scenario, the employee's TST result of 7 mm induration is negative and does not meet the threshold for latent TB infection.
A prior history of BCG vaccination does not change interpretation criteria in adults. The CDC explicitly recommends that TST results be interpreted regardless of BCG history, as vaccine-related reactivity typically wanes over time and induration should not be attributed to BCG alone. Therefore, a 7 mm reaction in a low- risk, asymptomatic healthcare worker does not require further diagnostic evaluation.
Option A (chest x-ray) is reserved for individuals with a positive TB test or symptoms suggestive of active TB. Option C (repeat testing) is not indicated unless this was part of a two-step baseline test and the first result was negative in a newly hired employee, which is not the case here. Option D is inappropriate because treatment is only considered after confirmed latent TB infection.
For the CIC exam, it is essential to recognize that no further action is required when TST induration is below the positive threshold for the individual's risk category, even in those with prior BCG vaccination.


問題 #58
An infection preventionist is reviewing a wound culture result on a surgery patient. The abdominal wound culture of purulent drainage grew Staphylococcus aureus with the following sensitivity pattern: resistant to penicillin, oxacillin, cephalothin, and erythromycin; susceptible to clindamycin, and vancomycin. The patient is currently being treated with cefazolin. Which of the following is true?

答案：D

解題說明：
The scenario involves a surgical patient with a purulent abdominal wound culture growing Staphylococcus aureus, a common pathogen in surgical site infections (SSIs). The Certification Board of Infection Control and Epidemiology (CBIC) emphasizes accurate interpretation of culture results and antibiotic therapy in the
"Identification of Infectious Disease Processes" and "Prevention and Control of Infectious Diseases" domains, aligning with the Centers for Disease Control and Prevention (CDC) guidelines for managing SSIs. The question requires assessing the sensitivity pattern and current treatment to determine the correct statement.
Option B, "The current therapy is not effective," is true. The wound culture shows Staphylococcus aureus resistant to oxacillin, indicating methicillin-resistant S. aureus (MRSA). The sensitivity pattern lists resistance to penicillin, oxacillin, cephalothin, and erythromycin, with susceptibility to clindamycin and vancomycin.
Cefazolin, a first-generation cephalosporin, is ineffective against MRSA because resistance to oxacillin (a penicillinase-resistant penicillin) implies cross-resistance to cephalosporins like cefazolin due to altered penicillin-binding proteins (PBPs). The CDC's "Guidelines for the Prevention of Surgical Site Infections" (2017) and the Clinical and Laboratory Standards Institute (CLSI) standards confirm that MRSA strains are not susceptible to cefazolin, meaning the current therapy is inappropriate and unlikely to resolve the infection, supporting Option B.
Option A, "The wound is not infected," is incorrect. The presence of purulent drainage, a clinical sign of infection, combined with a positive culture for S. aureus, confirms an active wound infection. The CBIC and CDC define purulent discharge as a key indicator of SSI, ruling out this statement. Option C, "Droplet Precautions should be initiated," is not applicable. Droplet Precautions are recommended for pathogens transmitted via respiratory droplets (e.g., influenza, pertussis), not for S. aureus, which is primarily spread by contact. The CDC's "Guideline for Isolation Precautions" (2007) specifies Contact Precautions for MRSA, not Droplet Precautions, making this false. Option D, "This is a methicillin-sensitive S. aureus (MSSA) strain," is incorrect. Methicillin sensitivity is determined by susceptibility to oxacillin, and the resistance to oxacillin in the culture result classifies this as MRSA, not MSSA. The CDC and CLSI use oxacillin resistance as the defining criterion for MRSA.
The CBIC Practice Analysis (2022) and CDC guidelines stress the importance of aligning antimicrobial therapy with sensitivity patterns to optimize treatment outcomes. The mismatch between cefazolin and the MRSA sensitivity profile confirms that Option B is the correct statement, indicating ineffective current therapy.
References:
* CBIC Practice Analysis, 2022.
* CDC Guidelines for the Prevention of Surgical Site Infections, 2017.
* CDC Guideline for Isolation Precautions, 2007.
* CLSI Performance Standards for Antimicrobial Susceptibility Testing, 2022.


問題 #59
A review of bronchoscopy specimens indicates an unusual number of Mycobacterium fortuitum-positive cultures. Which of the following observations would be the MOST likely cause of this finding?

答案：C

解題說明：
The CBIC Certified Infection Control Exam Study Guide (6th edition) identifies nontuberculous mycobacteria (NTM), including Mycobacterium fortuitum, as organisms commonly associated with water sources, particularly potable water systems. An unusual increase in M. fortuitum-positive bronchoscopy cultures is most often linked to waterborne contamination during endoscope reprocessing, making rinsing with tap water the most likely cause.
Tap water is not sterile and may harbor NTM, which are resistant to standard municipal water treatment and capable of forming biofilms within plumbing systems. If bronchoscopes are rinsed with tap water after high- level disinfection and not followed by appropriate sterile or filtered water rinses and thorough drying, organisms such as M. fortuitum may contaminate internal channels. This can lead to pseudo-outbreaks, where cultures are positive due to contamination rather than true patient infection.
Option B, inadequate cleaning prior to disinfection, can contribute to overall reprocessing failure but is less specifically associated with NTM contamination patterns. Option A is unlikely, as sporicidal solutions are effective disinfectants. Option D, drying with air or alcohol, is a recommended step to reduce microbial growth and would not cause contamination.
For CIC exam preparation, recognizing that tap water exposure during endoscope reprocessing is a classic source of nontuberculous mycobacteria contamination is a key concept in outbreak investigation and device reprocessing surveillance.


問題 #60
A hospital is experiencing an increase in vancomycin-resistant Enterococcus (VRE) infections in the hematology-oncology unit. Which of the following interventions is MOST effective in halting the spread of VRE in this high-risk setting?

答案：A

解題說明：
Comprehensive and Detailed In-Depth Explanation:
Hand hygiene remains the single most effective intervention to prevent the spread of vancomycin-resistant Enterococcus (VRE) in healthcare settings. Implementing an audit and feedback system significantly improves compliance and reduces VRE transmission.
Step-by-Step Justification:
* Hand Hygiene Compliance Audit and Feedback (Best Strategy)
* Studies show that poor hand hygiene is the primary mode of VRE transmission in hospitals.
* Implementing real-time auditing with feedback ensures sustained compliance and helps identify weak areas.
* Why Other Options Are Incorrect:
* A. Screening all patients and isolating VRE-positive patients:
* While screening helps identify carriers, contact precautions alone are not sufficient without strong hand hygiene enforcement.
* B. Restricting vancomycin use:
* While antimicrobial stewardship is crucial, vancomycin use alone does not drive VRE outbreaks-poor infection control practices do.
* D. Conducting environmental sampling weekly:
* Routine sampling is not necessary; immediate terminal disinfection and improved hand hygiene are more effective.
CBIC Infection Control References:
* APIC Text, "VRE Prevention and Hand Hygiene," Chapter 11.
* APIC-JCR Workbook, "Antimicrobial Resistance and Infection Control Measures," Chapter 7.


問題 #61
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