CONTACT:   Alice Mares, Communication Outreach Specialist, Thurston County Public Health and Social Services, (360) 463-6122 or tcphss.pio@co.thurston.wa.us; Dr. Jen Freiheit, Director, Thurston County Public Health and Social Services

Swimmer’s Itch reported at Long Lake Park in Lacey 
Possible Parasites in Long Lake Park 

OLYMPIA – Thurston County Public Health and Social Services advises members of the community that the parasite that causes swimmer’s itch appears to be present in Long Lake, located in Lacey, WA. Multiple reports were received from individuals who swam at Long 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.  

Swimmer’s itch is more prevalent during the summer months and can occur in freshwater bodies around the world, not just at Long Lake.