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Background  The repertoire of free-living protozoa in contact lens solutions is poorly known despite the fact that such protozoa may act as direct pathogens and may harbor intra-cellular pathogens.    Methods  Between 2009 and 2014, the contact lens solutions collected from patients presenting at our Ophthalmology Department for clinically suspected keratitis, were cultured on non-nutrient agar examined by microscope for the presence of free-living protozoa. All protozoa were identified by 18S rRNA gene sequencing.    Results  A total of 20 of 233 (8.6 %) contact lens solution specimens collected from 16 patients were cultured . Acanthamoeba  amoeba in 16 solutions (80 %) collected from 12 patients and  Colpoda steini ,  Cercozoa  sp.,  Protostelium  sp. and a eukaryotic more closely related to  Vermamoeba  sp., were each isolated in one solution.  Cercozoa  sp.,  Colpoda  sp . ,  Protostelium  sp. and  Vermamoeba  sp. are reported for the first time as contaminating contact lens solutions.    Conclusion  The repertoire of protozoa in contact lens solutions is larger than previously known.

Repertoire of free-living protozoa in contact lens solutions