A sputum culture from a ventilated patient in an ICU grew Burkholderia cepacia. Additional surveillance identified two more patients with respiratory tract infections and B. cepacia. Past events showed a 15% increase over historical trends. What should the infection preventionist do next?

• A. Develop a source hypothesis
• B. Implement immediate isolation of all patients with respiratory symptoms
• C. Start empiric antibiotic therapy for all respiratory patients
• D. Notify public health authorities immediately

Answer: (A)

When you see Burkholderia cepacia causing infections in several ventilated ICU patients and the cases rise above historical levels, you’re dealing with an outbreak. The crucial next move is to develop a source hypothesis about where the organism is coming from and how it’s spreading. This step guides the entire investigation: it targets the most likely sources—contaminated equipment, solutions, humidifiers, medications, or care practices—and determines what environmental sampling and data to collect. By articulating a plausible source and transmission route, you can design focused tests and targeted containment—such as removing suspect devices, stopping use of a particular solution, or changing cleaning protocols—without resorting to broad, unverified actions.

This approach also supports safer patient care decisions: it avoids unnecessary broad antibiotic use, which isn’t appropriate for all respiratory cases and can drive resistance, and it prevents disruptive blanket isolation without evidence linking all cases. Public health involvement is important, but it’s most effective when informed by a tested hypothesis about the outbreak’s source. In the meantime, strengthening standard controls—hand hygiene, contact precautions for identified cases, and review of equipment and solutions—helps reduce transmission while the investigation unfolds.