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FRIDAY, May 25, 2018 (HealthDay News) — Outbreaks associated with treated recreational water with confirmed infectious etiology are usually caused by Cryptosporidium<\/i>, Legionella<\/i>, or Pseudomonas<\/i>, according to research published in the May 18 issue of the U.S. Centers for Disease Control and Prevention’s Morbidity and Mortality Weekly Report<\/i>.<\/p>\n
Michele C. Hlavsa, M.P.H., from the CDC in Atlanta, and colleagues describe 493 outbreaks associated with treated recreational water reported during 2000 to 2014.<\/p>\n
The researchers found that 58 percent of the 363 outbreaks with confirmed infectious etiology were caused by Cryptosporidium<\/i>, 16 percent by Legionella<\/i>, and 13 percent by Pseudomonas<\/i>. Overall, 24,453 cases were identified in the 363 outbreaks; 89, 4, and 3 percent were caused by Cryptosporidium<\/i>, Pseudomonas<\/i>, and Legionella<\/i>, respectively. Of the eight reported deaths, at least six occurred in persons affected by outbreaks caused by Legionella<\/i>. The leading setting was hotels, which were associated with 32 percent of the 493 outbreaks. The outbreaks had a bimodal temporal distribution: 56 percent started in June to August, and 9 percent started in March.<\/p>\n
“Assessment of trends in the annual counts of outbreaks caused by Cryptosporidium<\/i>, Legionella<\/i>, or Pseudomonas<\/i> indicate mixed progress in preventing transmission,” the authors write. “Pathogens able to evade chlorine inactivation have become leading outbreak etiologies.”<\/p>\n