Streptococcus parasuis
Species of bacterium
From Wikipedia, the free encyclopedia
Streptococcus parasuis is a species of Gram-positive, facultatively anaerobic bacteria in the genus Streptococcus. It was formally described in 2015 following its reclassification from serotypes 20, 22, and 26 of Streptococcus suis, based on phylogenetic and genomic evidence.[1]
| Streptococcus parasuis | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Kingdom: | Bacillati |
| Phylum: | Bacillota |
| Class: | Bacilli |
| Order: | Lactobacillales |
| Family: | Streptococcaceae |
| Genus: | Streptococcus |
| Species: | S. parasuis |
| Binomial name | |
| Streptococcus parasuis Nomoto et al. 2015 | |
| Type strain | |
| SUT-286T (= JCM 30273T, DSM 29126T) | |
Taxonomy
Streptococcus parasuis was delineated as a separate species from S. suis after analyses of 16S rRNA gene sequences, average nucleotide identity (ANI), and phenotypic traits showed significant divergence. Strains formerly classified as S. suis serotypes 20, 22, and 26 were reclassified as S. parasuis.[1]
Morphology and physiology
Streptococcus parasuis is a non-motile, coccus-shaped bacterium that occurs in chains or pairs. It is catalase-negative and α-hemolytic on blood agar. Growth occurs optimally at 37 °C under facultative anaerobic conditions.
Clinical significance
Although primarily isolated from pigs, S. parasuis has been recognized as a potential zoonotic pathogen. Clinical cases in humans, though rare, have included symptoms such as arthritis, peritonitis, and pneumonia.[2]