Infection Control Nurse Interview Questions

How to use these: do not memorise the answers — panels can tell. Use them to see the shape of a strong answer: a specific process, a decision rule, and what gets documented. Then fit your own examples into that shape.

1. How do you calculate a CAUTI rate, and why that way?

Infections per 1,000 catheter days — the numerator is catheter-associated urinary tract infections meeting the surveillance definition, the denominator is total catheter days across the unit. It is expressed per device day rather than per patient or per admission because the exposure is the catheter, not the admission. A ward with more catheterised patients will have more infections without being worse at care, and only a device-day denominator corrects for that.

2. Our CAUTI rate is rising. What do you do?

First verify the data — confirm the surveillance definition is being applied consistently and that device-day counting has not changed, because a sudden shift is often a measurement change. Then segment by unit, shift and insertion setting. Then look at both levers: insertion and maintenance practice, and catheter days. The second is usually the bigger win and is almost entirely nursing-controlled — a daily review asking whether each catheter is still needed reduces the denominator and the infections together. I would pick one unit, implement the daily review with a named owner, and trend it rather than judging a single month.

3. Your hand hygiene compliance is reported at 98%. What is your reaction?

Scepticism. Compliance that high almost always means the observation method is the problem rather than that practice is excellent — typically observers who are known, announced, or observing at convenient times, which produces the Hawthorne effect at full strength. I would check who observes, whether they are trained and whether they are observing all five moments including the ones that are usually missed, and I would validate with an independent observer. A credible figure that is lower is far more useful than a flattering one that no one believes.

4. How would you recognise and respond to an outbreak?

Recognition comes from routine surveillance showing a cluster above the expected baseline for that organism, unit and period — which is only possible if the baseline is known, so surveillance has to be running before the outbreak. Response: confirm the cluster is real with the microbiology laboratory, define a case definition and case list, implement control measures immediately rather than waiting for confirmation, isolate or cohort, review staff movement between affected and unaffected areas, reinforce precautions and hand hygiene, and convene the infection control committee. Communicate to affected units clearly, keep documentation contemporaneous, and report externally where required.

5. A ward refuses to isolate a patient because of bed pressure. How do you handle it?

State the transmission risk specifically rather than citing policy in the abstract — what organism, what route, what the consequence of not isolating is for the other patients in that bay. Offer the workable alternative, usually cohorting, rather than only the ideal. If it remains blocked I escalate to the nursing supervisor and the infection control officer, and document the recommendation and the response. The recurring lesson in this role is that a recommendation that is unworkable on a full ward will be ignored, so offering the practical second-best is often how you actually protect patients.

6. A unit consistently fails biomedical waste segregation audits. What do you do?

Treat it as a system problem before treating it as a discipline problem. Go and look at the point of disposal: are the right bins present, in the right places, correctly labelled and colour-coded, and not overflowing? A very large proportion of segregation failures are bin placement and availability, not attitude. Then check who has actually been trained, including new and agency staff who are routinely missed. Then feed the audit result back to that ward with the specific items found, rather than a score. Re-audit and show the change. Discipline is the last step, not the first.

7. How do you get busy nurses to comply with infection control?

By making the compliant action the easy action, and by giving feedback that is specific and local. Nobody changes practice because of a hospital-wide percentage; people change when they see their own unit's number and the specific finding. Beyond that: remove the practical obstacles, use link nurses in each unit so the message comes from a peer rather than from the infection control office, recognise units that improve, and never present infection control as a policing function. The moment staff see this role as enforcement, the reporting quality drops and you lose the surveillance data you depend on.