Settlement terms weren't disclosed in a federal judge's order that dismissed the wrongful death lawsuit on October 15.
Last year, Jeffrey Cusimano's parents sued NeilMed Pharmaceuticals Inc., maker of a "neti pot" that the 28-year-old used to clean his sinuses with water. They also sued Rheem Manufacturing Co., which made a water heater in his home.
Their lawsuit claimed defects in both devices allowed Cusimano to become infected by Naegleria fowleri, a microscopic organism that recently was found in St. Bernard Parish's water system.
A total of 32 infections linked to the amoeba were reported in the US between 2001 and 2010.
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Although their case against the companies has been resolved, Patrice and Nunzio Cusimano filed a separate wrongful death lawsuit against St. Bernard Parish in a state court earlier this month. Patrice Cusimano declined an interview request.
Thomas Moore, a physician who treated Jeffrey Cusimano, testified that he believed Cusimano's infection was caused by his use of the neti pot with tap water.
But in a court filing earlier this year, lawyers for NeilMed said Jeffrey Cusimano's parents couldn't prove that his use of the neti pot caused his death on June 7, 2011. Lab tests on his neti pot didn't find any traces of the amoeba, they said.