A species of gram-positive, coccoid bacteria isolated from skin lesions, blood, inflammatory exudates, and the upper respiratory tract of humans. It is a group A hemolytic Streptococcus that can cause SCARLET FEVER and RHEUMATIC FEVER
Bacteria -- Immunology -- Genetic aspects. : CRISPR-Cas systems : RNA-mediated adaptive immunity in bacteria and archaea / Rodolphe Barrangou, John van der Oost, editors
Bacteria -- Phylogeny : Phylogeny and evolution of bacteria and mitochondria / Mauro Degli Esposti, Center for Genomic Sciences, UNAM Campus de Cuernavaca, Cuernavaca, Morelos, Mexico
A phylum of bacteria consisting of the purple bacteria and their relatives which form a branch of the eubacterial tree. This group of predominantly gram-negative bacteria is classified based on homology of equivalent nucleotide sequences of 16S ribosomal RNA or by hybridization of ribosomal RNA or DNA with 16S and 23S ribosomal RNA