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NEW QUESTION # 116
The degree of infectiousness of a patient with tuberculosis correlates with
Answer: D
Explanation:
The infectiousness of tuberculosis (TB) is directly related to the number of Mycobacterium tuberculosis organisms expelled into the air by an infected patient.
Step-by-Step Justification:
* TB Transmission Mechanism:
* TB spreads through airborne droplet nuclei, which remain suspended for long periods.
* Factors Affecting Infectiousness:
* High bacterial load in sputum: Smear-positive patients are much more infectious.
* Coughing and sneezing frequency: More expelled droplets increase exposure risk.
* Environmental factors: Poor ventilation increases transmission.
Why Other Options Are Incorrect:
* A. Hand hygiene habits: TB is airborne, not transmitted via hands.
* B. Presence of acid-fast bacilli (AFB) in blood: TB is not typically hematogenous, and blood AFB does not correlate with infectiousness.
* C. Tuberculin skin test (TST) >20 mm: TST indicates prior exposure, not infectiousness.
CBIC Infection Control References:
* APIC Text, "Tuberculosis Transmission and Control Measures".
NEW QUESTION # 117
During an outbreak of ventilator-associated pneumonia (VAP), the infection preventionist should FIRST:
Answer: A
Explanation:
* Reviewing compliance with VAP prevention bundles (e.g., head-of-bed elevation, oral care, sedation breaks) is the first step in outbreak control.
* Preemptive antibiotics (B) are not recommended due to antibiotic resistance risks.
* Negative pressure rooms (C) are not required for VAP.
* Ventilator circuit cultures (D) do not guide patient management.
CBIC Infection Control References:
* APIC Text, "VAP Prevention Measures," Chapter 11.
NEW QUESTION # 118
Following recent renovations on an oncology unit, three patients were identified with Aspergillus infections.
The infections were thought to be facility-acquired. Appropriate environmental microbiological monitoring would be to culture the:
Answer: A
Explanation:
The scenario describes an outbreak of Aspergillus infections among three patients on an oncology unit following recent renovations, with the infections suspected to be facility-acquired. Aspergillus is a mold commonly associated with environmental sources, particularly airborne spores, and its presence in immunocompromised patients (e.g., oncology patients) poses a significant risk. The infection preventionist must identify the appropriate environmental microbiological monitoring strategy, guided by the Certification Board of Infection Control and Epidemiology (CBIC) and CDC recommendations. Let's evaluate each option:
* A. Air: Aspergillus species are ubiquitous molds that thrive in soil, decaying vegetation, and construction dust, and they are primarily transmitted via airborne spores. Renovations can disturb these spores, leading to aerosolization and inhalation by vulnerable patients. Culturing the air using methods such as settle plates, air samplers, or high-efficiency particulate air (HEPA) filtration monitoring is a standard practice to detect Aspergillus during construction or post-renovation in healthcare settings, especially oncology units where patients are at high risk for invasive aspergillosis. This aligns with CBIC's emphasis on environmental monitoring for airborne pathogens, making it the most appropriate choice.
* B. Ice: Ice can be a source of contamination with bacteria (e.g., Pseudomonas, Legionella) or other pathogens if improperly handled or stored, but it is not a typical reservoir for Aspergillus, which is a mold requiring organic material and moisture for growth. While ice safety is important in infection control, culturing ice is irrelevant to an Aspergillus outbreak linked to renovations and is not a priority in this context.
* C. Carpet: Carpets can harbor dust, mold, and other microorganisms, especially in high-traffic or poorly maintained areas. Aspergillus spores could theoretically settle in carpet during renovations, but carpets are not a primary source of airborne transmission unless disturbed (e.g., vacuuming). Culturing carpet might be a secondary step if air sampling indicates widespread contamination, but it is less direct and less commonly recommended as the initial monitoring site compared to air sampling.
* D. Aerators: Aerators (e.g., faucet aerators) can harbor waterborne pathogens like Pseudomonas or Legionella due to biofilm formation, but Aspergillus is not typically associated with water systems unless there is significant organic contamination or aerosolization from water sources (e.g., cooling towers). Culturing aerators is relevant for waterborne outbreaks, not for an Aspergillus outbreak linked to renovations, making this option inappropriate.
The best answer is A, culturing the air, as Aspergillus is an airborne pathogen, and renovations are a known risk factor for spore dispersal in healthcare settings. This monitoring strategy allows the infection preventionist to confirm the source, assess the extent of contamination, and implement control measures (e.g., enhanced filtration, construction barriers) to protect patients. This is consistent with CBIC and CDC guidelines for managing fungal outbreaks in high-risk units.
References:
* CBIC Infection Prevention and Control (IPC) Core Competency Model (updated 2023), Domain IV:
Environment of Care, which recommends air sampling for Aspergillus during construction-related outbreaks.
* CBIC Examination Content Outline, Domain III: Prevention and Control of Infectious Diseases, which includes environmental monitoring for facility-acquired infections.
* CDC Guidelines for Environmental Infection Control in Healthcare Facilities (2022), which advocate air culturing to detect Aspergillus post-renovation in immunocompromised patient areas.
NEW QUESTION # 119
Which of the following processes is essential for endoscope reprocessing?
Answer: A
Explanation:
The correct answer is B, "Pre-cleaning, leak testing, and manual cleaning," as these processes are essential for endoscope reprocessing. According to the Certification Board of Infection Control and Epidemiology (CBIC) guidelines, proper reprocessing of endoscopes is critical to prevent healthcare-associated infections (HAIs), given their complex design and susceptibility to microbial contamination. The initial steps of pre-cleaning (removing gross debris at the point of use), leak testing (ensuring the endoscope's integrity to prevent fluid ingress), and manual cleaning (using enzymatic detergents to remove organic material) are foundational to the reprocessing cycle. These steps prepare the endoscope for high-level disinfection or sterilization by reducing bioburden and preventing damage, as outlined in standards such as AAMI ST91 (CBIC Practice Analysis,
2022, Domain III: Infection Prevention and Control, Competency 3.3 - Ensure safe reprocessing of medical equipment). Failure at this stage can compromise subsequent disinfection, making it a non-negotiable component of the process.
Option A (intermediate level disinfection and contact time) is an important step but insufficient alone, as intermediate-level disinfection does not achieve the high-level disinfection required for semi-critical devices like endoscopes, which must eliminate all microorganisms except high levels of bacterial spores. Option C (inspection using a borescope and horizontal storage) includes valuable quality control (inspection) and storage practices, but these occur later in the process and are not essential initial steps; vertical storage is often preferred to prevent damage. Option D (leak testing, manual cleaning, and low level disinfection) includes two essential steps (leak testing and manual cleaning) but is inadequate because low-level disinfection does not meet the standard for endoscopes, which require high-level disinfection or sterilization.
The emphasis on pre-cleaning, leak testing, and manual cleaning aligns with CBIC's focus on adhering to evidence-based reprocessing protocols to ensure patient safety and prevent HAIs (CBIC Practice Analysis,
2022, Domain III: Infection Prevention and Control, Competency 3.4 - Implement environmental cleaning and disinfection protocols). These steps are mandated by guidelines to mitigate risks associated with endoscope use in healthcare settings.
References: CBIC Practice Analysis, 2022, Domain III: Infection Prevention and Control, Competencies 3.3 - Ensure safe reprocessing of medical equipment, 3.4 - Implement environmental cleaning and disinfection protocols. AAMI ST91:2015, Flexible and semi-rigid endoscope processing in health care facilities.
NEW QUESTION # 120
Healthcare workers are MOST likely to benefit from infection prevention education if the Infection Preventionist (IP)
Answer: A
Explanation:
The correct answer is D, "involves the staff in determining the content," as this approach is most likely to benefit healthcare workers from infection prevention education. According to the Certification Board of Infection Control and Epidemiology (CBIC) guidelines, effective education programs are tailored to the specific needs and contexts of the learners. Involving staff in determining the content ensures that the educational material addresses their real-world challenges, knowledge gaps, and interests, thereby increasing engagement, relevance, and application of the learned principles (CBIC Practice Analysis, 2022, Domain IV:
Education and Research, Competency 4.1 - Develop and implement educational programs). This participatory approach fosters ownership and accountability among healthcare workers, enhancing the likelihood that they will adopt and sustain infection prevention practices.
Option A (brings in speakers who are recognized experts) can enhance credibility and provide high-quality information, but it does not guarantee that the content will meet the specific needs of the staff unless their input is considered. Option B (plans the educational program well ahead of time) is important for logistical success and preparedness, but without staff involvement, the program may lack relevance or fail to address immediate concerns. Option C (audits practices and identifies deficiencies) is a valuable step in identifying areas for improvement, but it is a diagnostic process rather than a direct educational strategy; education based solely on audits might not engage staff effectively if their input is not sought.
The focus on involving staff aligns with CBIC's emphasis on adult learning principles, which highlight the importance of learner-centered education. By involving staff, the IP adheres to best practices for adult education, ensuring that the program is practical and tailored, ultimately leading to better outcomes in infection prevention (CBIC Practice Analysis, 2022, Domain IV: Education and Research, Competency 4.2 - Evaluate the effectiveness of educational programs). This approach also supports a collaborative culture, which is critical for sustaining infection control efforts in healthcare settings.
References: CBIC Practice Analysis, 2022, Domain IV: Education and Research, Competencies 4.1 - Develop and implement educational programs, 4.2 - Evaluate the effectiveness of educational programs.
NEW QUESTION # 121
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