The Associated Press (AP) reported on August 6, 2005, that two boys, ages 7 and 9, in Tulsa, Oklahoma, died on Friday, August 5, from infection with Naegleria fowleri. This parasite enters the body through the nose while the person is swimming underwater or diving and travels to the central nervous system, causing brain inflammation (primary amebic meningoencephalitis). The parasite is usually found in stagnant water such as ponds, but as a precaution the Tulsa Health Department closed three city pools on Friday for testing. The two boys are not related, but both came to their doctors with symptoms of fever, hallucinations, and headaches, and despite medical care neither was able to survive the deadly infection. The AP notes that of the 200 known cases of Naegleria infection in the past 40 years, only two people have survived. Only 24 infections were documented in the U.S. between 1989 and 2000.