Protothecosis is a rare infection caused by environmentally ubiquitous achlorophyllic microalgae of the genus Prototheca. Here, we describe a first case of protothecosis in a carp (Cyprinus carpio), which is at the same time the first case of protothecosis in a fish, confirmed by phenotype- and molecular-based methods, including PCR sequencing of the rDNA cluster and protein profiling using matrix-assisted laser desorption ionization time-of-flight mass spectrometry.
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