LTC-CIP Outbreak Detection and Investigation Questions
Published 2026-10-25 · Facts and text checked 2026-10-16 · Questions from our LTC-CIP study guide · Reviewed by Hana N., Quality Reviewer
These free LTC-CIP practice questions cover Outbreak Detection and Investigation, part of Surveillance and Epidemiologic Investigation (22 items) on the exam. Recognizing, investigating and controlling outbreaks in a facility. Each question comes from a practice test in our LTC-CIP study guide and shows the correct answer with an explanation. The full exam has 150 questions (135 scored).
Recognizing, investigating and controlling outbreaks in a facility. On the exam this is part of Surveillance and Epidemiologic Investigation (22 items). Open each answer to read the explanation.
Question 1Medium
A facility has an influenza outbreak on one unit. Which condition must be met before the unit can safely resume admissions?
Show answer and explanation
Correct answer: C. 48 hours have passed since the last case completed antiviral treatment and has been afebrile without fever-reducing medication
For influenza, the unit generally reopens 48 hours after the last case completes antiviral treatment and is afebrile without fever-reducing medication. A shorter afebrile interval or the first-case date does not satisfy the standard.
From practice test 10 of our LTC-CIP study guide (question 128). Original question, not an official exam item.
Question 2Easy
After the last case of norovirus resolves, what is the generally accepted period before reopening the closed unit?
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Correct answer: B. 48 to 72 hours after the last case resolves
The standard closure period for norovirus is 48 to 72 hours after the last case resolves, which allows time for the virus to be cleared and for environmental cleaning. Reopening sooner risks a second wave.
From practice test 6 of our LTC-CIP study guide (question 111). Original question, not an official exam item.
Question 3Easy
An epidemic curve for a point-source outbreak, such as a single contaminated meal served at one banquet, would most likely appear as:
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Correct answer: D. A single sharp peak, with most cases occurring within one incubation period
A point-source outbreak results from a single shared exposure, so cases cluster around one incubation period and form one sharp peak. The other patterns describe propagated transmission, an ongoing reservoir, or multiple separate exposures.
From practice test 2 of our LTC-CIP study guide (question 39). Original question, not an official exam item.
Question 4Medium
During a norovirus outbreak on the east wing, a nurse who works the east wing in the morning is scheduled to float to the west wing in the afternoon. Which measure is the single most effective way to prevent spread to the west wing?
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Correct answer: B. Assign dedicated staff to the affected unit and keep them there.
Dedicating staff to the affected unit prevents a nurse from carrying the pathogen to a clean unit. Changing scrubs is a secondary measure and does not eliminate the risk of the nurse transporting the pathogen from the affected unit.
From practice test 8 of our LTC-CIP study guide (question 64). Original question, not an official exam item.
Question 5Easy
During an influenza outbreak, the infection preventionist is identifying potentially exposed staff and residents. Which incubation window should guide the look-back period before the first case's symptom onset?
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Correct answer: B. 1 to 4 days
Influenza has an incubation period of 1 to 4 days. The 12 to 48 hour window is characteristic of norovirus and should not be used for influenza exposure review.
From practice test 7 of our LTC-CIP study guide (question 62). Original question, not an official exam item.
Question 6Easy
During a confirmed norovirus outbreak, which cleaning agent is the most appropriate for routine disinfection of high-touch surfaces in resident rooms?
Show answer and explanation
Correct answer: C. An EPA-registered disinfectant with a specific claim against norovirus, such as a freshly diluted bleach solution.
Norovirus is non-enveloped and resistant to many common disinfectants, including most quaternary ammonium compounds and alcohol. A disinfectant with an EPA-registered norovirus claim, typically a bleach solution, is required for reliable inactivation.
From practice test 3 of our LTC-CIP study guide (question 56). Original question, not an official exam item.
Question 7Hard
During the debrief of a gastroenteritis outbreak, the infection preventionist reviews the line list and epidemic curve. Which finding most strongly indicates that the true scope of the outbreak was underrecognized?
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Correct answer: B. A resident on an adjacent unit had vomiting within the outbreak time frame but was charted as an unrelated event and never added to the line list.
A symptomatic resident who meets the case definition and whose onset falls within the outbreak period but who was never placed on the line list is direct evidence of underrecognition. A single-peak curve, a gap between early cases, or timing around unit closure does not by itself show that cases were missed.
From practice test 8 of our LTC-CIP study guide (question 87). Original question, not an official exam item.
Question 8Medium
An epidemic curve shows successive waves of new cases, with each peak occurring roughly one incubation period after the previous one. This pattern most strongly indicates:
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Correct answer: C. Person-to-person transmission, with each wave representing a generation of spread
Successive peaks separated by about one incubation period are the signature of propagated, person-to-person transmission. A one-time food contamination or single group activity would produce a single point-source peak.
From practice test 10 of our LTC-CIP study guide (question 88). Original question, not an official exam item.
Question 9Easy
During a gastroenteritis outbreak, 5 residents among the 25 residents on a unit develop vomiting and diarrhea within 48 hours. Which calculation gives the attack rate?
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Correct answer: B. 5 divided by 25, multiplied by 100
Attack rate equals the number of new cases divided by the number of residents at risk, expressed as a percentage, so 5 divided by 25 gives 20 percent. Dividing by 20 excludes the cases from the denominator and overstates the rate.
From practice test 9 of our LTC-CIP study guide (question 19). Original question, not an official exam item.
Question 10Hard
Outbreak response protocols in LTC often use two cases of the same syndrome linked by place and time as an action threshold rather than waiting for a statistically significant signal. What is the primary reason for this low threshold?
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Correct answer: C. Waiting for statistical significance delays action by hours or days, allowing further transmission.
Two linked cases do not prove the agent or source, and there is no universal two-case notification requirement.
From practice test 4 of our LTC-CIP study guide (question 83). Original question, not an official exam item.
Question 11Hard
An infection preventionist plots cases by date of laboratory test collection rather than by date of symptom onset. How does this distort the epidemic curve?
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Correct answer: D. It shifts cases to later dates, which can obscure the common-source or propagated pattern
Plotting by testing date shifts cases to later dates, obscuring whether the outbreak is point source or propagated. The epidemic curve should always use date of symptom onset to reveal the true transmission pattern.
From practice test 2 of our LTC-CIP study guide (question 33). Original question, not an official exam item.
Question 12Medium
At 7:00 a.m., two residents on the same nursing unit develop vomiting and diarrhea within two hours of each other. No gastroenteritis cases have occurred on that unit in the past month. Based on standard long-term care thresholds, the infection preventionist should:
Show answer and explanation
Correct answer: A. Immediately investigate, because two or more cases of acute gastroenteritis in a single unit within 24 to 48 hours warrant investigation
Two or more cases of acute gastroenteritis in one unit within 24 to 48 hours is the recognized threshold for immediate investigation in long-term care. Waiting for a third case or treating the cases as sporadic would delay control measures.
From practice test 8 of our LTC-CIP study guide (question 142). Original question, not an official exam item.
Question 13Medium
An infection preventionist has five ill residents and ten well residents on the same wing. Which comparison is most useful to test the hypothesis that a specific group activity is the source?
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Correct answer: D. Proportion of ill residents who attended the activity compared with proportion of well residents who attended it
A case-control comparison of exposure frequency tests whether the activity is associated with illness. Comparing symptoms, age, or medications does not address the common-exposure hypothesis.
From practice test 3 of our LTC-CIP study guide (question 147). Original question, not an official exam item.
Question 14Medium
An infection preventionist at a long-term care facility identifies two residents on the same unit with acute gastroenteritis within 36 hours. No laboratory results are available yet. When should the facility notify the local public health authority?
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Correct answer: D. Within 24 hours of suspecting the outbreak; some jurisdictions require a phone call within a few hours
Public health agencies require early notification of suspected long-term care outbreaks, generally within 24 hours, and some require a call within hours for gastrointestinal or respiratory clusters. Waiting for laboratory confirmation or for the outbreak to end delays critical support and surveillance.
From practice test 7 of our LTC-CIP study guide (question 123). Original question, not an official exam item.
Question 15Medium
Cases continue to occur at the same rate after new precautions are introduced. Which action is the most reliable way to determine whether the controls are actually being followed?
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Correct answer: A. Directly observe hand hygiene, cohorting, and cleaning practices on the unit
Direct observation verifies actual practice. Policy review and staff reports can miss gaps in adherence, and repeat testing does not evaluate whether controls are being executed.
From practice test 3 of our LTC-CIP study guide (question 34). Original question, not an official exam item.
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