Streptococcus milleri group

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Streptococcus milleri
Streptococcus anginosus.tif
Cultures of Streptococcus anginosus on blood agar
Scientific classification
Kingdom: Bacteria
Phylum: Firmicutes
Class: Bacilli
Order: Lactobacillales
Family: Streptococcaceae
Genus: Streptococcus
Streptococcus milleri group
Classification and external resources
MeSH B03.510.400.800.872.875.475, B03.510.550.737.872.875.475, B03.510.400.800.872.875.475,

Streptococcus milleri is an unofficial name applied to a group of basically similar viridans streptococci species[1] showing various hemolytic, serological, and physiological characteristics. The species name Streptococcus anginosus has recently been recognized as the approved name for these organisms. 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] The unique characteristic of them from other pathogenic streptococci, such as S. pyogenes and S. agalactiae, is their ability to cause abscesses.[3][4]

Further information: Streptococcus anginosus


Members include:[2]


These non-hemolytic viridans streptococci were first described by Guthof in 1956 after being isolated from dental abscesses. He named these organisms "Streptococcus milleri" in honor of the microbiologist W. D. Miller.[5][6]


The organisms were subsequently recognized as normal flora of the human oral cavity and gastrointestinal tract with the ability to cause abscesses and systemic infections.[7]


  1. ^ Streptococcus milleri group at the US National Library of Medicine Medical Subject Headings (MeSH)
  2. ^ a b Ruoff, K L (Jan 1988). "Streptococcus anginosus ("Streptococcus milleri"): the unrecognized pathogen" (PDF). Clinical Microbiology Reviews 1 (1): 102–108. doi:10.1128/CMR.1.1.102. PMC 358032. PMID 3060239. 
  3. ^ Gossling, J (Mar–Apr 1988). "Occurrence and pathogenicity of the Streptococcus milleri group". Reviews of infectious diseases 10 (2): 257–85. doi:10.1093/clinids/10.2.257. PMID 3287560. 
  4. ^ Rashid, R. M.; Salah, W.; Parada, J. P. (1 February 2007). "'Streptococcus milleri' aortic valve endocarditis and hepatic abscess". Journal of Medical Microbiology 56 (2): 280–282. doi:10.1099/jmm.0.46781-0. 
  5. ^ Whiley, RA; Beighton, D (January 1991). "Emended descriptions and recognition of Streptococcus constellatus, Streptococcus intermedius, and Streptococcus anginosus as distinct species". International journal of systematic bacteriology 41 (1): 1–5. doi:10.1099/00207713-41-1-1. PMID 1995029. 
  6. ^ Verrall, R (November 1986). "The Streptococcus milleri group". Infection Control and Hospital Epidemiology 7 (11): 558–60. doi:10.1017/S0195941700065334. JSTOR 30146431. PMID 3640746. 
  7. ^ Mejàre, B; Edwardsson, S (November 1975). "Streptococcus milleri (Guthof); an indigenous organism of the human oral cavity". Archives of oral biology 20 (11): 757–62. doi:10.1016/0003-9969(75)90048-5. PMID 1061530.