The health and park departments have received dozens of reports of people getting sick within a day or two of swimming at Horseshoe Lake. The source of the illness is still being investigated.
Officials are asking people who got sick after swimming in the lake between Thursday and Sunday to contact the health department.
The county park appears to be the only area on Horseshoe Lake affected by the illness.
Correction, July 17, 2014: Horseshoe Lake park is a Kitsap County park. A headline on an earlier version of this story characterized the park incorrectly.
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