NR-442 Community Health Nursing - Set 2 - Part 2

Correct Answer: The maximum incubation period of measles

Quarantine holds exposed but well people through the longest time the disease could take to appear. Because a person may look healthy while incubating, the maximum incubation period is the interval that must pass safely. Option b is incorrect because the communicable period governs isolation and school exclusion for someone who already has measles. This classmate has no illness yet, so there is nothing to isolate and nothing being shed. Option c is incorrect because rash fading is a recovery milestone in a person who became ill, and this student never developed a rash. Waiting on a sign that may never appear gives no usable end point. Option d is incorrect because serologic conversion is a laboratory event used to confirm infection or immunity, not a public health release criterion. Quarantine decisions rest on how long incubation can last, not on antibody timing.

Correct Answer: Entering attendee contact details into the line list

Collecting and recording names and contact details is a structured clerical task with a clear procedure and no clinical judgment attached. The nurse retains the analysis and every decision that follows from it. Option a is incorrect because building a case definition requires clinical criteria plus judgments about person, place, and time restrictions. Setting those boundaries determines who counts as a case, which sits squarely inside professional practice. Option b is incorrect because reading a curve means drawing conclusions about how an agent spread through a group. Interpretation of assessment data cannot be handed to an unlicensed worker no matter how well trained. Option c is incorrect because choosing control measures commits the agency to actions that affect an entire community. Such decisions rest with the professional accountable for the investigation, not with an assistant carrying out assigned tasks.

Correct Answer: Recall bias between cases and controls

Recall bias occurs when cases and controls remember past exposures with different intensity. Mothers of affected infants dig harder for a cause, which inflates reported exposure among cases and exaggerates the apparent association. Option a is incorrect because selection bias concerns who gets enrolled, such as pulling controls from a hospital where people are sicker than the public. This scenario turns on what enrolled participants said afterward. Option b is incorrect because a confounder must be a genuine risk factor for the outcome that also tracks with the exposure. Uneven memory is a measurement problem, and no third variable appears in this description. Option d is incorrect because attrition threatens designs that follow people forward over years, and a case-control study collects its data at one interview. Nobody in this scenario dropped out before information was gathered.

Correct Answer: Hold the dose and notify the prescriber promptly.

Jaundice, dark urine, anorexia, and fatigue point to drug induced liver injury from isoniazid, rifampin, or pyrazinamide. The dose is held and the prescriber notified so liver enzymes can be checked before therapy continues. Option a is incorrect because these findings describe organ damage in progress, not dehydration. Waiting until the next visit allows continued exposure to a hepatotoxic drug at the point where injury can become severe. Option b is incorrect because pyridoxine prevents the peripheral neuropathy isoniazid causes; it does nothing for the liver. Vitamin supplementation addresses a different adverse effect and would leave the current dose unchecked. Option c is incorrect because isoniazid absorption drops when taken with meals, and comfort measures do not answer yellow sclerae. Treating this as simple stomach upset misses the one symptom that changes management immediately.

Correct Answer: You have latent infection and cannot infect other people.

A positive test with no symptoms, a clear chest film, and negative sputum defines latent tuberculosis infection. The bacilli are walled off and not multiplying, so the client is not infectious and needs no isolation. Option b is incorrect because contagiousness belongs to active disease, where organisms multiply in the lungs and are expelled by coughing. This client's negative smear and absent cough mean nothing is being released into the air. Option c is incorrect because masking the household protects against an airborne source that does not exist here. Such advice stigmatizes the client and disrupts family life while adding no measurable protection to anyone. Option d is incorrect because an airborne isolation room is reserved for suspected or confirmed infectious pulmonary disease. Latent infection carries no transmission risk, so hospitalizing this client would restrict liberty for no public health gain.

Correct Answer: Passive surveillance awaiting provider reports

Passive surveillance means the health department waits for providers and laboratories to send reports on their own initiative. It is inexpensive and broad, and its named weakness is under-reporting whenever a busy provider forgets. Option a is incorrect because active surveillance has the department telephone or visit providers to hunt for cases and gather details. This department initiates nothing at all, which is the opposite of that effort. Option c is incorrect because sentinel systems draw data from a small chosen set of high quality reporting sites, such as clinics tracking influenza like illness. No selection of special sites is described here. Option d is incorrect because syndromic monitoring watches signals that arrive before any diagnosis, including emergency department complaints and school absences. The department here is collecting confirmed hepatitis diagnoses, which arrive after laboratory work.

Correct Answer: Exposed workers had greater risk than unexposed workers

Relative risk compares risk in the exposed with risk in the unexposed. A value of exactly one means no difference, and any value above one means the exposed group carried the greater risk. Option b is incorrect because a reduced risk in the exposed group would push the ratio below one instead. Reading a number above one as a decrease inverts the comparison the ratio was built to express. Option c is incorrect because the null value for a relative risk is one, the point at which both groups face identical risk. A result sitting well above that mark is describing a real difference between the groups. Option d is incorrect because protection shows up as a ratio under one, such as a vaccine that cuts disease sharply. Calling this solvent protective would reverse the finding and could keep dangerous exposures in place.

Correct Answer: Odds ratios arise from case-control designs

Case-control studies begin with people who already have the disease, so true risk cannot be calculated and the odds ratio is used instead. Cohort studies and trials follow people forward and yield relative risk. Option a is incorrect because randomized trials produce a relative risk because they follow assigned groups forward, and they are not the source of the odds ratio the question describes. Cohort studies report relative risk too. Option b is incorrect because a cohort enrolls people free of disease and watches who develops it, which allows genuine risk to be measured. Having real risks available, a cohort reports relative risk, not odds. Option d is incorrect because a snapshot survey measures everything at once and cannot say who developed disease after exposure. Without that sequence there is no incidence, and relative risk is built entirely from incidence.

Correct Answer: The wheel, since a genetic core sits central

The wheel model places the host and its genetic core at the hub, ringed by physical, biological, and social environments. It is the frame the course applies to inherited conditions where environmental triggers precipitate episodes. Option a is incorrect because the triangle depends on an external agent that must be present, which fits infectious disease. An inherited disorder carries its cause within the host, leaving that leg of the model empty. Option c is incorrect because the web suits chronic conditions built from many contributing causes with no single origin. Inheritance here is the origin, and a model that spreads causation evenly would obscure it. Option d is incorrect because natural history charts a disease forward from susceptibility through resolution to organize prevention over time. It answers when to intervene rather than explaining what brought the condition about.

Correct Answer: The client with prior vaccine anaphylaxis

Anaphylaxis to a prior dose of the same vaccine is an absolute contraindication. The other three describe false contraindications, and withholding influenza vaccine from any of them would be a missed opportunity to protect a worker. Option a is incorrect because egg allergy no longer restricts influenza vaccination at any severity. Any licensed, age-appropriate product may be given, and this change removed one of the most common reasons adults were turned away. Option b is incorrect because a family history of reactions, seizures or allergies belongs on the list of things that never contraindicate a vaccine. What happened to a relative predicts nothing about this client's own response. Option c is incorrect because lactating clients are routinely immunized; inactivated influenza vaccine poses no risk to a nursing infant and maternal antibody in milk adds protection. Deferring here would leave both mother and baby exposed.

Correct Answer: Household members who share sleeping quarters nightly.

The concentric circle approach starts with the closest and longest duration contacts, which is the household. Shared sleeping air over many hours creates the highest transmission risk, and the circle widens only if infection is found there. Option a is incorrect because coworkers belong to an outer ring evaluated only after the inner circle shows transmission. Office exposure is usually shorter and better ventilated than a shared bedroom over many nights. Option c is incorrect because brief shared rides carry low risk and the riders cannot even be identified. Spending scarce investigation resources there would delay testing of the people most likely to be infected. Option d is incorrect because outdoor conversation gives almost no chance for droplet nuclei to accumulate. Transmission needs enclosed, poorly ventilated, shared air over time, which a sidewalk greeting never provides.

Correct Answer: Descriptive data raise questions that further study must test

Descriptive epidemiology answers what, who, where, and when, and generates hypotheses. It cannot establish cause because it does not compare exposed with unexposed groups, so analytic work must follow to test what the pattern suggests. Option a is incorrect because clustering by place may reflect poverty, housing age, or who happens to live there. Naming one exposure as proven skips the comparison that would be needed to support the claim. Option b is incorrect because a striking pattern still carries no comparison group and no proof that exposure came first. Strength of a signal invites investigation; it does not substitute for testing the idea. Option c is incorrect because deaths are a poor lens for a condition most people survive, and mortality figures answer a different question. Cause is established through analytic designs, whatever outcome is counted.

Correct Answer: Arranging abatement of the deteriorated lead paint

The environment includes the physical surroundings that bring agent and host together. Removing or sealing deteriorated lead paint eliminates the source in the building itself, which protects every child living there rather than one at a time. Option a is incorrect because handwashing changes the behavior of the host and depends on families repeating it perfectly. Dust keeps settling while the paint deteriorates, so the source of exposure remains in place. Option b is incorrect because testing identifies children already exposed and is secondary prevention directed at the host. Finding more cases is useful, yet it leaves the hazard producing new ones untouched. Option d is incorrect because treatment addresses harm that has already occurred in individual children. Sending them home to the same apartments guarantees re-exposure, which is why the building itself has to be fixed.

Correct Answer: Work with officials to stop cider sales

Control measures begin as soon as a source is plausibly suspected rather than after the investigation closes. Pulling the suspected vehicle stops further exposure while confirmatory testing continues, which matches how bedside nurses remove a threat first. Option b is incorrect because waiting for the laboratory leaves the public drinking the suspect product for several more days. Testing timelines are measured in days, and every day of delay adds preventable cases. Option c is incorrect because communicating findings is the closing step of an investigation, undertaken once hypotheses are settled and control is underway. Writing a report now would document an exposure that is still actively harming people. Option d is incorrect because further analysis refines a hypothesis that the evidence already supports well enough to act upon. More numbers change nothing for the family buying cider at that booth this afternoon.

Correct Answer: Record minimum and maximum temperatures each workday

Reading and documenting the minimum and maximum temperatures at the start of every workday is the routine check that detects an excursion before doses are given. It is a concrete task that fits within this staff member's scope. Option a is incorrect because door shelves swing through the widest temperature range in any refrigerator and are never used for vaccine. Teaching this would build a cold chain failure into the clinic's daily routine. Option b is incorrect because a weekly glance at a dial cannot detect an overnight excursion that has already ruined a supply. Current standards call for a digital data logger with a buffered probe recording continuously. Option c is incorrect because stock rotation runs the other way. Vials with the shortest expiration date belong in front so they are used first, and reversing that order guarantees expired product accumulates at the back.

Correct Answer: I will take vitamin B six and avoid alcohol.

Isoniazid interferes with vitamin B six and causes peripheral neuropathy, which daily pyridoxine prevents. Alcohol sharply raises the risk of liver injury, the drug's other major adverse effect, so avoiding it matters throughout therapy. Option b is incorrect because food reduces isoniazid absorption. The drug is taken on an empty stomach, an hour before eating or two hours afterward, so that adequate blood levels are reached. Option c is incorrect because latent infection produces no symptoms to begin with, so feeling healthy signals nothing about the bacteria. Stopping early leaves live organisms behind and the lifetime risk of progression intact. Option d is incorrect because discolored urine belongs to rifampin, which this client is not taking. Expecting a change that will never appear suggests the teaching about which drug does what did not land.

Correct Answer: Open windows and sleep in a well ventilated room.

Airborne bacilli are diluted and carried away by moving air, so open windows, fans exhausting outdoors, sleeping alone, and time outside are the measures that actually reduce household transmission. Option a is incorrect because the respirator is worn by people entering the room, not by the source. A client who must be around others wears a surgical mask, which contains the droplets being produced. Option b is incorrect because a sealed room concentrates droplet nuclei rather than clearing them. Homes have no negative pressure or exhaust system, so trapped air becomes more hazardous to anyone who enters. Option d is incorrect because infectiousness ends well before the six month course does, once smears turn negative and the client improves on adequate therapy. Total separation for months is neither necessary nor sustainable.

Correct Answer: Arrange an interferon gamma release blood test instead.

Interferon gamma release assays use antigens absent from the BCG strain, so prior vaccination does not cause a false positive. They also need a single visit with no return reading, which suits a new employee. Option a is incorrect because no allowance is subtracted from a skin test reading for previous vaccination. The measured induration is interpreted against the client's risk category exactly as it is recorded. Option c is incorrect because radiography is the step that follows a positive screening test, not a substitute for one. Using films to screen well people exposes them to radiation and misses latent infection entirely. Option d is incorrect because BCG gives partial protection against severe childhood disease and does not make an adult immune. Skipping screening would let a nursing home employee carry unrecognized infection into a high risk setting.

Correct Answer: Report the case and explain the legal duty

Reporting a notifiable condition is a legal mandate that does not require client consent, and privacy law expressly permits disclosure to public health authorities. The nurse reports, then explains why the law requires it. Option a is incorrect because a client cannot waive a duty the state places on the provider. Suppressing the report blocks contact investigation and directly observed therapy, leaving exposed household members undiagnosed and still spreading disease. Option b is incorrect because signed authorization belongs to ordinary disclosures such as sending records to an employer. Mandatory public health reporting sits outside that framework entirely, and no signature is sought or needed. Option c is incorrect because the reporting trigger is the diagnosis itself, not the client's later cooperation. Tying the report to treatment refusal delays it by weeks, and tuberculosis reports are expected within one day.

Correct Answer: The susceptible human host

Immunization converts susceptible people into immune people, so the measles virus meets fewer hosts it can infect and sustained transmission stops. Protecting the host is the classic population-level way to break this final link. Option a is incorrect because the portal of exit is contained by cough etiquette or masking the infected person. Vaccinating well neighbors changes nothing about how virus leaves someone already ill. Option b is incorrect because agent-directed measures are things like antivirals, disinfection and sterilization that kill or inactivate the organism. A vaccine never touches circulating virus; it prepares the people the virus would otherwise reach. Option d is incorrect because measles has no environmental reservoir to clean up; humans are the only source. Draining water or chlorinating a supply fits waterborne and vector-borne problems, which is a different control question entirely.