Survey of Naegleria fowleri in geothermal recreational waters of Guadeloupe (French West Indies)

• Published in: PloS one Vol. 8; no. 1; p. e54414
• Main Authors: Moussa, Mirna, De Jonckheere, Johan F, Guerlotté, Jérôme, Richard, Vincent, Bastaraud, Alexandra, Romana, Marc, Talarmin, Antoine
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 18-01-2013; Public Library of Science (PLoS)
• Subjects: Agar; Amebiasis - epidemiology; Amebiasis - microbiology; Amoeba; Bacteriology; Baths; Biology; Central Nervous System Protozoal Infections - epidemiology; Central Nervous System Protozoal Infections - microbiology; Chemistry; Child; Cooling; DNA, Ribosomal - genetics; E coli; Encephalitis; Escherichia coli; Genotype; Geothermal energy; Guadeloupe; Health care; Hot Springs - microbiology; Humans; Infections; Life Sciences; Medicine; Meningitis; Meningoencephalitis; Microbiology and Parasitology; Naegleria; Naegleria fowleri; Naegleria fowleri - isolation & purification; Naegleria fowleri - pathogenicity; Parasitic diseases; Plates; Plating baths; Polymerase chain reaction; Primary amebic meningoencephalitis; Recreation; Recreational waters; Sediments; Sediments (Geology); Studies; Surveys; Thermal baths; Tourists; Volcanoes; Water analysis; Water purification; Water sampling; Guadeloupe; Strasbourg France; France; West Indies
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0054414

In 2008 a fatal case of primary amoebic meningoencephalitis, due to the amoeboflagellate Naegleria fowleri, occurred in Guadeloupe, French West Indies, after a child swam in a bath fed with geothermal water. In order to improve the knowledge on free-living amoebae in this tropical part of France, we investigated on a monthly basis, the presence of Naegleria spp. in the recreational baths, and stream waters which feed them. A total of 73 water samples, 48 sediments and 54 swabs samples were collected from 6 sampling points between June 2011 and July 2012. The water samples were filtered and the filters transferred to non-nutrient agar plates seeded with a heat-killed suspension of Escherichia coli while sediment and swab samples were placed directly on these plates. The plates were incubated at 44°C for the selective isolation of thermophilic Naegleria. To identify the Naegleria isolates the internal transcribed spacers, including the 5.8S rDNA, were amplified by polymerase chain reaction and the sequence of the PCR products was determined. Thermophilic amoebae were present at nearly all collection sites. The pathogenic N. fowleri was the most frequently encountered thermophilic species followed by N. lovaniensis. The concentration of N. fowleri was rather low in most water samples, ranging from 0 to 22 per liter. Sequencing revealed that all N. fowleri isolates belonged to a common Euro-American genotype, the same as detected in the human case in Guadeloupe. These investigations need to be continued in order to counsel the health authorities about prevention measures, because these recreational thermal baths are used daily by local people and tourists.