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Difficulty: HardInfection Control and Hospital-Acquired Conditions

During a monthly morbidity and mortality review, the chief medical officer notes that three patients in the bone marrow transplant unit have developed confirmed *Legionella pneumophila* pneumonia over the past 14 days. All three patients had been hospitalized continuously for at least three weeks prior to symptom onset. A facility-wide waterborne outbreak is strongly suspected.

Arrange the following administrative and environmental infection control steps in the most appropriate chronological sequence to safely manage this hospital-associated outbreak.

  1. 1Verify that the patient cluster meets the incubation criteria for definitive healthcare-associated transmission.
  2. 2Implement immediate point-of-use water restrictions and provide alternate water sources to patients.
  3. 3Conduct a comprehensive environmental assessment and obtain water cultures from facility plumbing.
  4. 4Execute systemic water system remediation using hyperchlorination or thermal eradication.
  5. 5Discontinue water restrictions following consecutive negative post-remediation environmental cultures.

Answer

The correct sequence for managing a suspected healthcare-associated Legionella outbreak is to first confirm the outbreak criteria, immediately implement water restrictions to protect vulnerable patients, conduct environmental sampling to locate the source, perform systemic remediation of the water supply, and finally lift restrictions only after follow-up cultures prove eradication.
Outbreak investigation prioritizes rapid patient safety alongside methodical epidemiological tracing. Step 1 confirms the threat. Step 2 mitigates immediate risk via restriction. Step 3 gathers environmental data (which would be ruined if Step 4 happened first). Step 4 is the definitive environmental treatment. Step 5 is the required safety verification.

Step-by-Step Solution

1
Verify that the patient cluster meets the criteria for healthcare-associated transmission.
Establishes the epidemiological reality of an outbreak.
Prevents unnecessary disruption if cases were community-acquired. Because these patients were hospitalized for >14 days before onset, the definitive healthcare-associated criteria are met.
2
Implement immediate point-of-use water restrictions (e.g., bottled water, halting shower usage).
Halts ongoing transmission to vulnerable patients immediately.
Patient safety is the highest priority. Waiting for environmental culture results (which take up to 14 days) before restricting water would leave vulnerable patients exposed.
3
Conduct environmental assessment and obtain water cultures.
Maps the location and extent of the Legionella colonization within the facility plumbing.
Sampling must occur before remediation, as decontamination will destroy the ability to identify the precise environmental source.
4
Execute systemic water system remediation (hyperchlorination or superheating).
Eradicates the pathogen from the hospital plumbing infrastructure.
Aggressive environmental decontamination is necessary to permanently resolve the hazard once the extent of the outbreak is understood.
5
Verify eradication and lift restrictions.
Returns the unit to normal operations.
Ensures the remediation was successful via consecutive negative post-remediation cultures before putting patients back at risk.

Key Concept

Management of hospital-acquired Legionella outbreaks requires immediate patient protection (water restriction) before environmental culturing, followed by culturing prior to systemic water remediation.
Estimated Time:1m 30s
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Topics

Infection Control and Hospital-Acquired Conditions

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