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Streptococcus anginosus group

  (Redirected from Streptococcus milleri)

The Streptococcus anginosus group (SAG), also known as the anginosus group streptococci (AGS) or the milleri group streptococci (MGS), are a group of several species of streptococci with clinical similarities. The group is named after a principal member species, Streptococcus anginosus. The older name Streptococcus milleri (as well as Streptococcus milleri group, SMG) is now pseudotaxonomic, as the idea that these streptococci constituted a single species was incorrect. 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] The unique characteristic of them from other pathogenic streptococci, such as S. pyogenes and S. agalactiae, is their ability to cause abscesses.[3][4]

Streptococcus milleri
Streptococcus anginosus.tif
Cultures of Streptococcus anginosus on blood agar
Scientific classification



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". 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. PMID 17244814.
  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.

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