The Waco Tribune-Herald reports Centers for Disease Control and Prevention is testing at BSR Cable Park's Surf Resort, which voluntarily closed on Friday.
"The CDC collected water samples and are now investigating to find the source".
CDC is assisting the Waco-McLennan County Public Health District on an investigation into a potential Naegleria fowleri exposure at an aquatic facility.
As a result of this sample, the water system will be performing a 60 day "chlorine burn", where the residual chlorine will be maintained at somewhat higher levels than normal.
It's unclear if the park remained closed on Sunday morning and the CDC did not immediately respond to a call seeking information on whether others who visited could have Naegleria fowleri.
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Naegleria fowleri is a microscopic amoeba which is a single-celled living organism.
Stabile is believed to have contracted Naegleria fowleri during a visit to the BSR Cable Park in Waco, Texas.
Infection typically occurs when people go swimming or diving in warm freshwater places, like lakes and rivers. Once the amoeba enters the nose, it travels to the brain where it causes PAM, which is usually fatal. The fatality rate, however, is more than 97%, with just four people surviving of the 143 reported infections in the United States between 1962 and 2017.
You can not be infected with Naegleria fowleri by drinking contaminated water and the amoeba is not found in salt water.
Symptoms include headache, fever, nausea, vomiting, loss of balance and seizures.