Four Caesarean Section Wound Infections in Six Weeks: Outbreak or Noise?
You are the newly appointed quality and patient-safety officer at a 60-bed hospital in the southern West Bank. Over six weeks there were 42 caesarean sections and four surgical site infections: two superficial, one deep, and one with pus requiring reopening. The infection-control nurse resigned two months ago and has not been replaced. There is no on-site microbiology laboratory; wound swabs are sent to Ramallah with a five-day turnaround. During a walk-round you find hand-rub dispensers empty in two of four wards, the autoclave log incomplete for three days, and the theatre corridor used for storing clean linen and used instruments at the same time. Cefazolin prophylaxis is documented in 33 of 42 records, with timing recorded in 21. Three infections followed emergency sections at night; the fourth followed an elective section. One surgeon performed 14 of the 42 operations and two of the infected cases. The director asks whether this is an outbreak and what to do first.
1. How do you decide whether this is an outbreak, and what do you do in the first 72 hours?
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Start by defining and counting, because 'four cases' has no meaning without a denominator and a baseline.
Case definition: a patient who had a caesarean section at this hospital in the stated period and developed a surgical site infection (superficial, deep or organ-space) within 30 days, with pus, wound dehiscence, or a wound requiring reopening, plus at least one of pain, tenderness, fever or a positive culture.
Compare with baseline: calculate the rate, 4/42 = 9.5%, and compare it with the hospital's own historical rate and with accepted benchmarks (typically around 3–5% for caesarean sections). Check whether ascertainment has changed - a new quality officer looking for infections will find more of them than a departed nurse did. That alone can create an apparent outbreak.
First 72 hours: review all 42 records for fever, readmission and reopening; examine the four patients and obtain wound cultures (deep swabs or pus, not superficial swabs) plus blood cultures if febrile; line-list each case by date, surgeon, theatre, operating time, night or day, prophylaxis timing, BMI and diabetes; inspect theatre ventilation, instrument decontamination and the autoclave logs; and inspect the wards' hand-hygiene facilities. Notify the Ministry of Health infection-control unit early rather than after the investigation is complete.
2. Which control measures do you prioritise, given that several problems compete for limited staff and money?
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Rank by likely attributable risk and by feasibility without new funding.
- Restore hand hygiene immediately - refill and place dispensers, place alcohol rub at every bed and at theatre entry, and make ward managers responsible for a daily check. This costs little and addresses a known driver of infection.
- Separate clean and dirty flows in theatre - remove used instruments and clean linen from the corridor, designate a one-way route, and stop storage in that space. This is a zero-cost organisational fix with a same-day effect.
- Re-establish decontamination assurance - complete the autoclave logs, verify sterilisation cycles and quarantine instruments until the logs are reconciled; audit instrument reprocessing against written procedure.
- Standardise antibiotic prophylaxis - cefazolin within 60 minutes before incision, weight-adjusted, with timing recorded on the theatre record as a mandatory field; re-dose for long operations and high blood loss. The 21/42 timing documentation is itself a care gap.
- Targeted review of emergency night sections - review staffing, supervision and aseptic technique, but avoid blaming individual clinicians.
- Cover the vacant infection-control post and give it a written mandate; an unfilled post is the root cause of most of the above.
Do not wait for microbiology results to start measures 1–3.
3. How will you measure whether the measures work, and how do you handle the surgeon who feels accused?
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Measurement. Use a simple monthly run chart of the surgical site infection rate with clear numerators and denominators, plotted against the baseline, plus process measures that change faster than outcome: percentage of records with prophylaxis timing documented, percentage of hand-rub dispensers filled on daily check, and percentage of autoclave cycles with complete logs. Review at 30 days, 3 months and 6 months, and be explicit that a fall in infection rate needs several months to appear - process measures give earlier feedback. Add post-discharge surveillance by telephone at 30 days, since many wound infections present after discharge and are invisible to a hospital-based count.
The surgeon. Meet privately and frame it as a system review, not an individual audit. Explain that two of 14 is within what chance alone can produce, that case-mix and emergency night work differ, and that no conclusion about the surgeon is possible or intended from these numbers - but that his cooperation on prophylaxis timing and technique review is essential. Offer confidential individual feedback. Do not name him in the report to the director. If clustering by surgeon persists after system fixes, handle it through the standard clinical governance process with due process and support, and document everything.