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Cryptosporidium outbreak associated with Bothell pool

Investigators said five swimmers were tested and four had crypto as the parasite spread after one infected pool user.

  • On Sept 30, Public Health Seattle-King County linked 14 cases of crypto to the McMenamins Anderson School pool in Bothell following exposure on Aug 29–30, 2026.
  • Even in well-maintained pools, Cryptosporidium resists chlorine and can survive for several days; Public Health determined the McMenamins facility follows King County health requirements.
  • Laboratory testing confirmed four of five symptomatic individuals who spent time in the pool had crypto, with symptoms typically appearing 2–10 days after infection.
  • PREVENTION Public Health advises, "Don't go to a pool if you're sick!" and recommends avoiding public pools for at least 2 weeks after being sick.
  • The CDC notes crypto is common, with over 800,000 cases annually in the U.S.; those suspecting illness from a pool should submit complaints via Public Health Service Request Access.
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Vashon-Maury Island BeachcomberVashon-Maury Island Beachcomber
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Cryptosporidium outbreak associated with Bothell pool

Caused by the highly contagious parasite Cryptosporidium, cryptosporidiosis (crypto) often causes watery diarrhea.

·Vashon, United States
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Mercer Island Reporter broke the news in Mercer Island, United States on Wednesday, September 30, 2026.
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