Occurrence and control of Naegleria fowleri in drinking water wells

Charles P. Gerba, Barbara L. Blair, Payal Sarkar, Kelly R. Bright, R. C. MacLean, Francine Marciano-Cabral

Research output: Chapter in Book/Report/Conference proceedingChapter

7 Scopus citations


Naegleria fowleri is a water-based protozoan found naturally in soil and warm waters. The deaths of two children due to N. fowleri in the Phoenix, Arizona, metropolitan area occurred in 2002, and the drinking water obtained from groundwater was found to be the source of the exposure. A survey was conducted of municipal drinking water wells in central and southern Arizona. N. fowleri was identified in 11 of 143 wells tested. The calculated Ct (chlorine concentration × time) for N. fowleri cysts by free chlorine was 31 for a 99% reduction at room temperature, pH 7.5 and trophozoites 6. Chlorination can be used to control N. fowleri transmission via drinking water with appropriate guidance related to proper dosages and contact times.

Original languageEnglish (US)
Title of host publicationGiardia and Cryptosporidium
Subtitle of host publicationFrom Molecules to Diseases
PublisherCABI Publishing
Number of pages10
ISBN (Print)9781845933913
StatePublished - Feb 25 2009

ASJC Scopus subject areas

  • General Veterinary
  • General Agricultural and Biological Sciences


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