Streptococcus: Genus of bacteria
Streptococcus is a genus of spherical Gram-positive bacteria belonging to the phylum Firmicutes and the lactic acid bacteria group.
They are cocci, meaning that they are shaped like spheres or circles. Cellular division occurs along a single axis in these bacteria, and thus they grow in chains or pairs, hence the name from Greek στρεπτος streptos, meaning easily bent or twisted, like a chain (twisted chain). Contrast this with staphylococci, which divide along multiple axes and generate grape-like clusters of cells. Streptococci are oxidase and catalase-negative, and many are facultative anaerobes.
| Streptococcus | |
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| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | Lactobacillales |
| Family: | Streptococcaceae |
| Genus: | Streptococcus Rosenbach, 1884 |
| Species | |
| S. agalactiae | |
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