Top 5 Takeaways

  1. Outbreak Identification and Response: In March 2023, Maine CDC investigated a Pseudomonas aeruginosa outbreak at a hotel pool. Among 35 guests surveyed, 23 developed symptoms like ear pain and rash after swimming during March 4-5.
  2. Source of Infection: P. aeruginosa was identified in skin lesion cultures from three patients. SNP analysis suggested a common exposure source, likely the hotel swimming pool.
  3. Hotel Pool Violations: Inspections revealed multiple violations at the hotel pool, including inadequate chlorine maintenance and no functioning disinfectant feeder, contributing to the outbreak.
  4. Public Health Implications: The case underscores the importance of proper maintenance and public health compliance in preventing outbreaks at recreational water venues.
  5. Prevention Strategies: Recommendations include maintaining chlorine concentration, rigorous management, and public health messaging to pool users, especially during peak seasons (January-April).

Original Article Author and Citation

Corresponding Author:

Liz Lamere,

Suggested Citation:

Lamere L, Smith E, Grieser H, Arduino M, Hlavsa MC, Combes S. Pseudomonas Infection Outbreak Associated with a Hotel Swimming Pool — Maine, March 2023. MMWR Morb Mortal Wkly Rep 2024;73:32–36. DOI:


The Maine CDC initiated an investigation in response to illnesses among hotel A guests. The outbreak, caused by P. aeruginosa, was linked to the hotel’s swimming pool. Key factors included inadequate chlorine concentration and pool maintenance.


An epidemiological investigation was conducted using questionnaires distributed to guests. Laboratory analysis confirmed P. aeruginosa in skin lesion samples. Pool inspections revealed several health code violations.


The outbreak illustrates the risk P. aeruginosa poses in inadequately maintained pools. It highlights the need for rigorous health safety measures and public awareness to prevent similar outbreaks.


Effective prevention and management of recreational water venues are critical for public health safety. Compliance with health codes and proactive measures are essential to prevent outbreaks, particularly in peak seasons.

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