The infection preventionist (IP) is working with Environmental Services to evaluate a new disinfectant for purchase by the facility. With which of the following should the IP be MOST concerned?
Correct Answer: A
When evaluating a new disinfectant, theinfection preventionist's primary concern must be the safety and effectiveness of the product. This includes ensuring the product is EPA-registered, effective against targeted pathogens, safe for both the environment and users, and compliant with regulatory guidelines. * From theAPIC/JCR Workbook, key considerations include: "Organizations should evaluate each product to ensure that it can be used safely and include a review of dilutions, storage, shelf life, PPE needed, and disposal and ventilation requirements to ensure that OSHA, EPA, or local requirements are met". * TheCBIC Study Guidereinforces that: "Safety and efficacy are critical factors in evaluating new products, with particular emphasis on infection prevention and user safety". * The other options, while relevant, are not the most critical factors in determining product adoption from an infection control standpoint. References: APIC/JCR Workbook, 4th Edition, Chapter 8 - Disinfection and Sterilization CBIC Study Guide, 6th Edition, Product Evaluation Section
Question 27
The BEST roommate selection for a patient with active shingles would be a patient who has had
Correct Answer: A
A patient with active shingles (herpes zoster) is contagious to individuals who have never had varicella (chickenpox) or the varicella vaccine. The best roommate selection is someone who has received the varicella vaccine, as they are considered immune and not at risk for contracting the virus. Why the Other Options Are Incorrect? * B. Treatment with acyclovir - Acyclovir treats herpes zoster but does not prevent transmission to others. * C. A history of herpes simplex - Prior herpes simplex virus (HSV) infection does not confer immunity to varicella-zoster virus (VZV). * D. Varicella zoster immunoglobulin (VZIG) - VZIG provides temporary immunity but does not offer long-term protection like the vaccine. CBIC Infection Control Reference APIC guidelines recommend placing patients with active shingles in a room with individuals immune to varicella, such as those vaccinated.
Question 28
Which of the following patients with human immunodeficiency virus infection requires Airborne precautions?
Correct Answer: D
HIV patients require Airborne Precautions if they have tuberculosis (TB). A cavitary lesion in the upper lobe is highly suggestive of active pulmonary TB, which requires Airborne Precautions due to aerosolized transmission. Why the Other Options Are Incorrect? * A. 24-year-old male newly diagnosed with a CD4 count of 70 - Low CD4 count alone does not warrant Airborne Precautions unless there is active TB or another airborne pathogen. * B. 28-year-old female with Mycobacterium avium in sputum - Mycobacterium avium complex (MAC) is not airborne, and standard precautions are sufficient. * C. 36-year-old male with cryptococcal meningitis - Cryptococcus neoformans is not transmitted via the airborne route, so Airborne Precautions are unnecessary. CBIC Infection Control Reference Patients with HIV and suspected TB require Airborne Precautions until TB is ruled out.
Question 29
The Environmental Services department is purchasing a new disinfectant that is an approved hospital disinfectant with no tuberculocidal claim. This product is appropriate for cleaning which of the following items?
Correct Answer: C
Question 30
After defining and identifying cases in a possible cluster of infections, an infection preventionist should NEXT establish:
Correct Answer: C
When investigating a possible cluster of infections, an infection preventionist (IP) follows a structured epidemiological approach to identify the cause and implement control measures. The Certification Board of Infection Control and Epidemiology (CBIC) outlines this process within the "Surveillance and Epidemiologic Investigation" domain, which aligns with the Centers for Disease Control and Prevention (CDC) guidelines for outbreak investigation. The steps typically include defining and identifying cases, formulating a hypothesis, testing the hypothesis, and implementing control measures. The question specifies the next step after defining and identifying cases, requiring an evaluation of the logical sequence. Option C, "A hypothesis that will explain the majority of cases," is the next critical step. After confirming a cluster through case definition and identification (e.g., by time, place, and person), the IP should develop a working hypothesis to explain the observed pattern. This hypothesis might propose a common source (e.g., contaminated equipment), a mode of transmission (e.g., airborne), or a specific population at risk. The CDC's "Principles of Epidemiology in Public Health Practice" (3rd Edition, 2012) emphasizes that formulating a hypothesis is essential to guide further investigation, such as identifying risk factors or environmental sources. This step allows the IP to focus resources on testing the most plausible explanation before proceeding to detailed analysis or interventions. Option A, "The route of transmission," is an important element of the investigation but typically follows hypothesis formulation. Determining the route (e.g., contact, droplet, or common vehicle) requires data collection and analysis to test the hypothesis, making it a subsequent step rather than the immediate next action. Option B, "An appropriate control group," is relevant for analytical studies (e.g., case-control studies) to compare exposed versus unexposed individuals, but this is part of hypothesis testing, which occurs after the hypothesis is established. Selecting a control group prematurely, without a hypothesis, lacks direction and efficiency. Option D, "Whether observed incidence exceeds expected incidence," is a preliminary step to define a cluster, often done during case identification using baseline data or statistical thresholds (e.g., exceeding the mean plus two standard deviations). Since the question assumes cases are already defined and identified, this step is complete, and the focus shifts to hypothesis development. The CBIC Practice Analysis (2022) and CDC guidelines prioritize hypothesis formulation as the logical next step after case identification, enabling a targeted investigation. This approach ensures that the IP can efficiently address the cluster's cause, making Option C the correct answer. References: * CBIC Practice Analysis, 2022. * CDC Principles of Epidemiology in Public Health Practice, 3rd Edition, 2012.
