Draft Genome Sequence of Blood-Origin Streptococcus canis Strain FU149, Isolated from a Dog with Necrotizing Soft Tissue Infection

Draft genome sequence of emm103/ST1363 Streptococcus pyogenes strain AB1, isolated from the blood of a woman with peritonitis and toxic shock syndrome

We report the draft genome sequence of Streptococcus pyogenes strain AB1 isolated from the blood of a woman with peritonitis-toxic shock syndrome. The genome measured 1.855 Mbp, with a G + C content of 38.3%. Sequences unmapped to the reference genome sequence of M1 SF370 (GenBank accession number AE004092.2) were characterized.

Comparative genomic features of Streptococcus canis based on the pan-genome orthologous group analysis according to sequence type

Using bacterial pan-genome obtained through whole genome sequencing (WGS), coding DNA sequences (CDSs) can be clustered into pan-genome orthologous groups (POGs). We aimed to investigate comparative genomic features of Streptococcus canis based on POG analysis and to determine CDSs specific to prevalent sequence type (ST) 9. Twenty WGS datasets on S. canis strains from invasive and non-invasive specimens were retrieved from the National Center for Biotechnology Information Assembly database. Based on the WGS data, we performed comparative genome hybridization (CGH), pan- and core-genome prediction, Venn diagram test with five ST9 strains, and phylogenetic analysis, with ST determination. We compared the CDSs between seven ST9 and 13 non-ST9 strains. We observed genomic diversity based on CGH and Venn diagram. The predicted pan- and core-genomes contained 4,772 and 1,403 genes, respectively. We found five clades consisting of different STs (ST1, ST44/2, ST13/14, ST21/15/41, and ST9) based on phylogenetic tree. There were differences in four pathways (DNA restriction-modification system, DNA-mediated transposition, extracellular region, and response to oxidative stress) regulated by CDSs specific to ST9. Our findings describe genomic diversity in CGH and Venn diagram, pan- and core-genomes, five clades of genomes consisting of different STs, and unique CDS features associated to ST9.

Biofilm production ability and other microbiological features of Streptococcus canis

This study assessed biofilm production ability (BPA) and other microbiological features of Streptococcus canis strains. Companion animal-origin 40 strains from each year (2015/2017) were randomly selected with the host information, and three blood-origin strains from 2 humans/1 dog were included. We measured BPA using crystal violet staining, along with S. canis M-like protein (SCM) allele typing, sequence type (ST) determination, antimicrobial resistance (AMR) phenotyping/genotyping, and virulence-associated gene profiling (gbp-ap1-fp1-brp). BPA measurements revealed that 35 strains with BPA and 48 strains without BPA. There was association of the producer with isolation year (2017). We found association between the non-producer and SCM allele 1/ST9: there was association of the producer with SCM allele 10/ST21. We observed correlation between the producer and presence of AMR genotypes. There was association between the producer and ap1 detection and between non-producer and gbp detection. Our observations suggest the correlation between the producer and other microbiological features (isolation year/SCM allele type 10/ST21/presence of AMR genotypes/ap1 detection).