Swimmer's itch surfaces at Clear Lake in Thurston County

The parasite that causes swimmer's itch appears to be present at Clear Lake.

Thurston County Public Health & Social Services issued an advisory about the health hazard at the 180.70 acre lowland lake on Wednesday, Aug. 19.

"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," the advisory states.

"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."

The advisory goes on to state that 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 (health care) provider may recommend prescription-strength creams or lotions to alleviate symptoms," the advisory states.

The following steps aim to reduce the 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.  

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