"Streptococcus milleri" strains displaying a gliding type of motility

International Journal of Systematic Bacteriology
S BergmanK L Ruoff

Abstract

Isolates belonging to the "Streptococcus milleri" species group that appear to exhibit a gliding type of motility, which is expressed as spreading growth on certain types of agar media, are described. These strains resembled a biotype of "S. milleri" that is usually isolated from genitourinary sources and is notable for its ability to ferment a wide array of carbohydrates. This biotype, which is currently included in the species Streptococcus anginosus, has been implicated in cases of neonatal infection. The "S. milleri" isolates which we studied lacked any observable organelles of motility and gave negative results when they were tested in conventional motility test medium stab cultures. Colonies growing on certain agar media, however, spread over the surfaces of plates and increased in area with increasing time of incubation. Chocolate agar supported maximum spreading, while this characteristic was barely discernible on blood agar. Electron microscopy studies revealed that there was more production of extracellular glycocalyx by motile strains than by a nonmotile isolate having a similar biotype. The results of an analysis of 16S rRNA gene sequences suggested that the motile strains are closely related to S. anginosus and rep...Continue Reading

Citations

Mar 27, 1999·Oral Microbiology and Immunology·R A Whiley, D Beighton
Oct 5, 2002·Clinical Microbiology Reviews·Richard Facklam
Dec 30, 2006·Journal of Bacteriology·Chikara Kaito, Kazuhisa Sekimizu
Apr 25, 2008·Research in Microbiology·Emilie Dordet-FrisoniSabine Leroy
Aug 21, 2001·Aging & Mental Health·G M Charlesworth
Jul 5, 2001·The Australian and New Zealand Journal of Psychiatry·E Garralda

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