CONTACT:   Renae Miller, Public Information Supervisor, Thurston County Public Health and Social Services, (360) 463-0362 or renae.miller@co.thurston.wa.us; Dr. Jen Freiheit, Director, Thurston County Public Health and Social Services

Swimmer’s Itch Reported at Clear Lake
Possible parasites in Clear Lake. 

OLYMPIA – Thurston County Public Health & Social Services is advising members of the community that the parasite that causes swimmer’s itch appears to be present in Clear Lake. Reports were received from multiple individuals who swam at Clear Lake and appear to have swimmer’s itch. Additionally, swimmers at any freshwater lake need to be aware that this parasite may be present, and there are ways to avoid being infected by it. 

Swimmer’s itch, also called cercarial dermatitis, appears as a skin rash caused by an allergic reaction to certain microscopic parasites that infect some birds and mammals. These parasites are released from infected snails into fresh and salt water (such as lakes, ponds, and oceans). If the parasite comes into contact with a swimmer, it burrows into the skin, causing an allergic reaction and rash. 

Swimmer’s itch generally resolves on its own without lasting health effects, although it can cause discomfort. Common symptoms include tingling, burning, or itching of the skin. Individuals are advised to avoid scratching the affected area, as this may lead to secondary infection. In cases of severe itching, a healthcare provider may recommend prescription-strength creams or lotions to alleviate symptoms.

Follow these steps to reduce your likelihood of getting swimmer’s itch: 

• Choose not to swim in areas where swimmer’s itch is a known problem or where signs have been posted warning of unsafe water.
• Choose not to swim near or wade in marshy areas where snails are commonly found.
• Towel dry or shower immediately after leaving the water.
• Apply waterproof sunscreen to your body before entering the water to both protect you from the sun and reduce the ability of the parasite to attach to the skin.
• Do not attract birds (e.g., by feeding them) to areas where people are swimming.  

For more information about toxic algae blooms and health risks, and to see all Thurston County lake advisories, visit: www.thurstoncountywa.gov/lake-alerts