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The viridans streptococci are a large group of commensal streptococcal Gram-positive bacteria species that are α-hemolytic, producing a green coloration on blood agar plates (hence the name "viridans", from Latin "vĭrĭdis", green), although some species in this group are actually γ-hemolytic, meaning they produce no change on blood agar. [1]
The anginosus group streptococci are members of the viridans streptococci group. [1] They have been implicated as etiologic agents in a variety of serious purulent infections, but because of their heterogeneous characteristics, these organisms may be unrecognized or misidentified by clinical laboratorians. [ 2 ]
In the medical setting, the most important groups are the alpha-hemolytic streptococci S. pneumoniae and Streptococcus viridans groups, and the beta-hemolytic streptococci of Lancefield groups A and B (also known as "group A strep" and "group B strep"). Table: Medically relevant streptococci [10]
This is a list of bacteria that are significant in medicine. For viruses, see list of viruses ... viridans streptococci; B. Bacillus. Bacillus anthracis; Bacillus brevis;
Viridans may refer to: Viridans streptococci, large group of bacteria species; Achatinella viridans, species of mollusc; Aerococcus viridans, species of bacteria;
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 .
Streptococcus viridans: Pharynx Acinetobacter spp Anterior urethra Bacteroides spp External genitalia Candida albicans: Anterior urethra, external genitalia Corynebacterium spp Anterior urethra, external genitalia Enterobacteriaceae: Anterior urethra, external genitalia Streptococcus viridans: Anterior urethra, external genitalia Eikenella ...
Streptococcus pneumoniae and a group of oral streptococci (Streptococcus viridans or viridans streptococci) display alpha-hemolysis. This is sometimes called green hemolysis because of the color change in the agar. Other synonymous terms are incomplete hemolysis and partial hemolysis.