Nosocomial Legionella Water System — SCE Infectious Diseases MCQ
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Correct answer: C — Initiate case finding, source investigation and immediate water-system control measures
The epidemiological link plus a matching environmental isolate requires a coordinated outbreak response: active case finding, clinical and environmental microbiology, water-system risk assessment and immediate control or remediation. Legionella is acquired from contaminated aerosols rather than ordinary person-to-person spread, so negative-pressure isolation and mass antibiotic prophylaxis do not address the source. Waiting for another case risks further exposure.
Reference: UKHSA: Investigation of Legionnaires disease cases, clusters and outbreaks: https://www.gov.uk/government/publications/investigation-of-legionnaires-disease-cases-clusters-and-outbreaks