Louisiana Warns Against Tap Water for Contacts and Nasal Rinses

The Louisiana Department of Health said eight of the 10 infections were Acanthamoeba keratitis, an eye infection that can damage the cornea. Seven of these patients used contact lenses, and five experienced permanent vision loss. Two other cases this year affected the sinuses and brain; the brain infection was fatal. Both patients had compromised immune defenses and relied on nasal irrigation devices.

The amoeba can be found in water, soil and dust. Health officials said reported tap-water use does not prove that it caused the infections, but urged residents to follow safe practices. Routine consumption of tap water is not viewed as a source of Acanthamoeba infection.

For nasal rinsing, the department recommends distilled or sterile water, or water that has been boiled and cooled. Contact lens wearers should use lens solution rather than tap water to clean or store lenses, and take lenses out before swimming, bathing or entering a hot tub.

State epidemiologist Theresa Sokol said the infections are rare but can have serious consequences. The department has also alerted healthcare providers to raise awareness and support early recognition. It urged people with weakened immune systems to seek immediate medical care for symptoms including convulsions, disorientation, head pain, reduced strength, elevated temperature, sinus complaints, altered sight or atypical skin signs.