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NEW QUESTION # 71
Operating room records indicate that 130 joint replacements have been performed. These include 70 total hip replacements, 55 total knee replacements, and 5 shoulder replacements. Two postoperative surgical site infections (SSIs) were identified in total hip replacements. What is the infection rate/100 procedures for total hip replacements?
Answer: B
Explanation:
To determine the infection rate per 100 procedures for total hip replacements, use the following formula:
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Thus, the correct answer is B. 2.9 per 100 procedures.
CBIC Infection Control Reference
The methodology of calculating SSI rates aligns with guidelines from the National Healthcare Safety Network (NHSN) and standardized infection ratio (SIR) models used for hospital-specific SSI rates.
NEW QUESTION # 72
An employee is presenting to Occupational Health for clearance prior to starting work at a healthcare facility.
They have a history of having received the Bacillus Calmette-Guerin (BCG) vaccination. What is the preferred methodology for pre-work clearance?
Answer: B
Explanation:
The preferred methodology for pre-work clearance in this scenario is the interferon-gamma release assay (IGRA), making option C the correct choice. This conclusion is supported by the guidelines from the Certification Board of Infection Control and Epidemiology (CBIC), which align with recommendations from the Centers for Disease Control and Prevention (CDC) for tuberculosis (TB) screening in healthcare workers.
The employee's history of receiving the Bacillus Calmette-Guerin (BCG) vaccination, a vaccine commonly used in some countries to prevent severe forms of TB, is significant because it can cause false-positive results in the traditional Tuberculin skin test (TST) due to cross-reactivity with BCG antigens (CBIC Practice Analysis, 2022, Domain I: Identification of Infectious Disease Processes, Competency 1.3 - Apply principles of epidemiology).
The IGRA, such as the QuantiFERON-TB Gold test, measures the release of interferon-gamma from T-cells in response to specific TB antigens (e.g., ESAT-6 and CFP-10) that are not present in BCG or most non- tuberculous mycobacteria. This makes it a more specific and reliable test for detecting latent TB infection (LTBI) in individuals with a history of BCG vaccination, avoiding the false positives associated with the TST.
The CDC recommends IGRA over TST for BCG-vaccinated individuals when screening for TB prior to healthcare employment (CDC Guidelines for Preventing Transmission of Mycobacterium tuberculosis, 2005, updated 2019).
Option A (referral to tuberculosis clinic) is a general action but not a specific methodology for clearance; it may follow testing if results indicate further evaluation is needed. Option B (initial chest radiograph) is used to detect active TB disease rather than latent infection and is not a primary screening method for pre-work clearance, though it may be indicated if IGRA results are positive. Option D (two-step purified protein derivative-based Tuberculin skin test) is less preferred because the BCG vaccination can lead to persistent cross-reactivity, reducing its specificity and reliability in this context. The two-step TST is typically used to establish a baseline in unvaccinated individuals with potential prior exposure, but it is not ideal for BCG- vaccinated individuals.
The IP's role includes ensuring accurate TB screening to protect both the employee and patients, aligning with CBIC's focus on preventing transmission of infectious diseases in healthcare settings (CBIC Practice Analysis, 2022, Domain III: Infection Prevention and Control, Competency 3.2 - Implement measures to prevent transmission of infectious agents).
References: CBIC Practice Analysis, 2022, Domain I: Identification of Infectious Disease Processes, Competency 1.3 - Apply principles of epidemiology; Domain III: Infection Prevention and Control, Competency 3.2 - Implement measures to prevent transmission of infectious agents. CDC Guidelines for Preventing Transmission of Mycobacterium tuberculosis, 2005, updated 2019.
NEW QUESTION # 73
There has been an outbreak of foodborne illness in the community believed to be associated with attendance at a church festival. Which of the following is the MOST appropriate denominator for calculation of the attack rate?
Answer: C
Explanation:
The attack rate, a key epidemiological measure in outbreak investigations, is defined as the proportion of individuals who become ill after exposure to a suspected source, calculated as the number of cases divided by the population at risk. The Certification Board of Infection Control and Epidemiology (CBIC) emphasizes accurate outbreak analysis in the "Surveillance and Epidemiologic Investigation" domain, aligning with the Centers for Disease Control and Prevention (CDC) "Principles of Epidemiology in Public Health Practice" (3rd Edition, 2012). The question involves a foodborne illness outbreak linked to a church festival, requiring the selection of the most appropriate denominator to reflect the population at risk.
Option D, "Residents in the county who attended the festival," is the most appropriate denominator. The attack rate should be based on the total number of people exposed to the potential source of the outbreak (i.e., the festival), as this represents the population at risk for developing the foodborne illness. The CDC guidelines for foodborne outbreak investigations recommend using the number of attendees or participants as the denominator when the exposure is tied to a specific event, such as a festival. This approach accounts for all individuals who had the opportunity to consume the implicated food, providing a comprehensive measure of risk. Obtaining an accurate count of attendees may involve festival records, surveys, or estimates, but it directly reflects the exposed population.
Option A, "People admitted to hospitals with gastrointestinal symptoms," is incorrect as a denominator. This represents the number of cases (the numerator), not the total population at risk. Using cases as the denominator would invalidate the attack rate calculation, which requires a distinct population base. Option B,
"Admission tickets sold to the festival," could serve as a proxy for attendees if all ticket holders attended, but it may overestimate the at-risk population if some ticket holders did not participate or underestimate it if additional guests attended without tickets. The CDC advises using actual attendance data when available, making this less precise than Option D. Option C, "Dinners served at the festival," is a potential exposure- specific denominator if the illness is linked to a particular meal. However, without confirmation that all cases are tied to a single dinner event (e.g., a specific food item), this is too narrow and may exclude attendees who ate other foods or did not eat but were exposed (e.g., via cross-contamination), making it less appropriate than the broader attendee count.
The CBIC Practice Analysis (2022) and CDC guidelines stress the importance of defining the exposed population accurately for attack rate calculations in foodborne outbreaks. Option D best captures the population at risk associated with festival attendance, making it the most appropriate denominator.
References:
* CBIC Practice Analysis, 2022.
* CDC Principles of Epidemiology in Public Health Practice, 3rd Edition, 2012.
* CDC Guidelines for Foodborne Disease Outbreak Response, 2017.
NEW QUESTION # 74
A 2-yoar-old girl is admitted with a fractured tibia. At birth, she was diagnosed with congenital cytomegalovirus (CMV). Which of the following barrier precautions is appropriate for healthcare personnel caring for her?
Answer: A
Explanation:
Standard Precautions are sufficient for congenital cytomegalovirus (CMV), which means that gloves should be used when handling body fluids. CMV is primarily transmitted via direct contact with saliva, urine, or blood.
Why the Other Options Are Incorrect?
* A. Wear masks and gloves - Masks are not necessary unless performing high-risk aerosol- generating procedures.
* C. No barrier precautions are needed - Gloves are required when handling bodily fluids to prevent transmission.
* D. Use gowns, masks, gloves, and a private room - CMV does not require Contact or Airborne Precautions.
CBIC Infection Control Reference
APIC guidelines state that CMV transmission is prevented using Standard Precautions, primarily with glove use for body fluid contact.
NEW QUESTION # 75
Which of the following statements is true about the microbial activity of chlorhexidine soap?
Answer: B
Explanation:
Chlorhexidine soap is a widely used antiseptic agent in healthcare settings for hand hygiene and skin preparation due to its effective antimicrobial properties. The Certification Board of Infection Control and Epidemiology (CBIC) underscores the importance of proper hand hygiene and antiseptic use in the
"Prevention and Control of Infectious Diseases" domain, aligning with guidelines from the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO). Understanding the microbial activity of chlorhexidine is essential for infection preventionists to recommend its appropriate use.
Option D, "Persistent activity with a broad spectrum effect," is the true statement. Chlorhexidine exhibits a broad spectrum of activity, meaning it is effective against a wide range of microorganisms, including gram- positive and gram-negative bacteria, some fungi, and certain viruses. Its persistent activity is a key feature, as it binds to the skin and provides a residual antimicrobial effect that continues to inhibit microbial growth for several hours after application. This residual effect is due to chlorhexidine's ability to adhere to the skin's outer layers, releasing slowly over time, which enhances its efficacy in preventing healthcare-associated infections (HAIs). The CDC's "Guideline for Hand Hygiene in Healthcare Settings" (2002) and WHO's
"Guidelines on Hand Hygiene in Health Care" (2009) highlight chlorhexidine's prolonged action as a significant advantage over other agents like alcohol.
Option A, "As fast as alcohol," is incorrect. Alcohol (e.g., 60-70% isopropyl or ethyl alcohol) acts rapidly by denaturing proteins and disrupting microbial cell membranes, providing immediate kill rates within seconds.
Chlorhexidine, while effective, has a slower onset of action, requiring contact times of 15-30 seconds or more to achieve optimal microbial reduction. Its strength lies in persistence rather than speed. Option B, "Can be used with any hand lotion," is false. Chlorhexidine's activity can be diminished or inactivated by certain hand lotions or creams containing anionic compounds (e.g., soaps or moisturizers with high pH), which neutralize its cationic properties. The CDC advises against combining chlorhexidine with incompatible products to maintain its efficacy. Option C, "Poor against gram positive bacteria," is incorrect. Chlorhexidine is highly effective against gram-positive bacteria (e.g., Staphylococcus aureus) and is often more potent against them than against gram-negative bacteria due to differences in cell wall structure, though it still has broad-spectrum activity.
The CBIC Practice Analysis (2022) supports the use of evidence-based antiseptics like chlorhexidine, and its persistent, broad-spectrum activity is well-documented in clinical studies (e.g., Larson, 1988, Journal of Hospital Infection). This makes Option D the most accurate statement regarding chlorhexidine soap's microbial activity.
References:
* CBIC Practice Analysis, 2022.
* CDC Guideline for Hand Hygiene in Healthcare Settings, 2002.
* WHO Guidelines on Hand Hygiene in Health Care, 2009.
* Larson, E. (1988). Guideline for Use of Topical Antimicrobial Agents. Journal of Hospital Infection.
NEW QUESTION # 76
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