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Table 5 False-positive identifications have few unique k-mers. Using an extended taxonomy, the identifications in PT4 and PT10 were matched to single accessions (instead of to the species level). The likely true source of the mapped sequences was determined by subsequent BLAST searches and included 16S rRNA present in many uncultured bacteria, human small nucleolar RNAs (snRNAs), and phiX174

From: KrakenUniq: confident and fast metagenomics classification using unique k-mer counts

Sample

Matched microorganism

Reads

k-mers

Source

PT3

Clostridioides difficile

122

126

16S rRNA

PT4

Hepatitis C virus

JF343788.1 recombinant hepatitis C virus

101

3

Human snRNA

PT5

Akkermansia muciniphila

936

136

16S rRNA

PT10

Human betaherpesvirus 5

JN379815.1 human herpesvirus 5 strain U04, partial genome

63

5

phiX174