From: http://www.whale.to/vaccines/amoebas.html

Indeed, Seidel et al. (1982) reported on a successful treatment of primary amoebic meningoencephalitis. A nine-year-old girl complained of a mild headache, nausea, vomiting and increased lethargy. On the morning of admission she was unresponsive. Moving amoebas were found in her cerebrospinal fluid (CSF). The girl and her family had been swimming in Deep Creek hot springs in the San Bernardino National Forest on two occasions before the Onset of the girl's disease.
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I wrote blood sample instead of cerebrospinal fluid. I've lost many brain cells and memory in those 29 years.