Abstract

The protein composition of the soluble cellular extracts of 5 different strains of thermophilic Naegleria, comprising 2 pathogenic N. fowleri and 3 nonpathogenic Naegleria isolates, have been studied by isoelectric focusing on polyacrylamide gels. The two pathogenic N. fowleri strains, although originating from very different sources, show an identical protein pattern, and are easily differentiated by several characteristic bands from the group of thermophilic nonpathogenic Naegleria sp. The latter, closely related to one another, correspond to the new species N. lovaniensis. Besides being a practical identification method for Naegleria fowleri, isoelectric focusing seems to be an excellent method for investigating the taxonomy of the genus Naegleria.

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