Distribution and possible interrelationships of pathogenic and nonpathogenicAcanthamoeba from aquatic environments

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Abstract
Among the more recently discovered agents of human disease are small, free-living amebae belonging to the generaNaegleria andAcanthamoeba. An overview of the distribution ofAcanthamoeba in recent surveys of the near shore waters of the northeastern United States is presented. There appears to be a particular association between the presence ofAcanthamoeba in marine sediments and the sites of oceanic sludge dumping. Amebae belonging to the genusNaegleria have not been isolated from these marine sediments which routinely yieldedAcanthamoeba. Starch gel electrophoretic analysis of enzymes suggests that some isolates ofAcanthamoeba from oceanic sludge dump-sites are not members of previously recognized pathogenic species.