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Streptococcus is a genus of gram-positive or spherical bacteria that belongs to the family Streptococcaceae, within the order Lactobacillales (lactic acid bacteria), in the phylum Bacillota. [2] Cell division in streptococci occurs along a single axis , thus when growing they tend to form pairs or chains, which may appear bent or twisted.
Bacteria of the genus Enterococcus, formerly known as group D streptococci, were classified as members of the genus Streptococcus until 1984 and are included in the original Lancefield grouping. [4] Many—but not all—species of streptococcus are beta-hemolytic .
in 1905, Erwin F. Smith accepted 33 valid different names of bacterial genera and over 150 invalid names, [17] and Vuillemin, in a 1913 study, [18] concluded that all species of the Bacteria should fall into the genera Planococcus, Streptococcus, Klebsiella, Merista, Planomerista, Neisseria, Sarcina, Planosarcina, Metabacterium, Clostridium ...
Streptococcus Streptococcaceae are a family of Gram-positive bacteria , placed within the order Lactobacillales . [ 1 ] Representative genera include Lactococcus , Lactovum , and Streptococcus .
The genus Streptococcus has around 129 species and 23 subspecies [16] that benefit many microbiomes on the human body. There are many species that show non-pathogenic characteristics; however, there are some, like S. pneumoniae, that exhibit pathogenic characteristics in the human body. [17] [11]
Streptococcosis encompasses a spectrum of diseases caused by bacteria from the genera Streptococcus and Lactococcus. [12] Various species within these genera can cause infections in both wild and cultured animals, including fish and terrestrial species. Commonly affected organisms include:
Streptococcus. In 1985, members of the diverse genus Streptococcus were reclassified into Lactococcus, Enterococcus, Vagococcus, and Streptococcus based on biochemical characteristics, as well as molecular features.
Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus. These bacteria are extracellular , and made up of non-motile and non-sporing cocci (round cells) that tend to link in chains.