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Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Enterococcaceae, Genus Enterococcus, Enterococcus ratti  Teixeira et
al. 2001.
React weakly with Lancefield group D antiserum.
Old synonym:
Enterococcus rattus  Uhl et al 1998.
Gram-positive cocci, grouped in pairs or short chains. Nonmotile.
Colonies on sheep-blood agar are nonpigmented and alpha-hemolytic or
nonhemolytic. Facultatively anaerobic. Growth occurs at 10 ºC, at 45 ºC and in broth
containing 6.5% NaCl.
Isolated from intestines and feces of neonatal rats with diarrhoea. Susceptible to Vancomycin and Efrotomycin.
Associated with diarrhoeal disease in rats.
  1. Pavel Svec and  Luc A. Devriese, 2009: Genus I. Enterococcus (ex Thiercelin and Jouhaud 1903) Schleifer and Kilpper-Bälz 1984,
    32VP in Bergey’s Manual of Systematic Bacteriology, Second Edition, Volume Three, Vos, P.D.; Garrity, G.; Jones, D.; Krieg, N.R.;
    Ludwig, W.; Rainey, F.A.; Schleifer, K.-H.; Whitman, W.B. (Eds.), pp 594-606.
  2. L M Teixeira, M G Carvalho, M M Espinola, A G Steigerwalt, M P Douglas, D J Brenner, and R R Facklam. Enterococcus porcinus
    sp. nov. and Enterococcus ratti sp. nov., associated with enteric disorders in animals. Int J Syst Evol Microbiol September 2001 51:
  3. Etheridge ME, Vonderfecht SL. Diarrhea caused by a slow-growing Enterococcus-like agent in neonatal rats. Lab Anim Sci.
    1992 Dec;42(6):548-50.
Positive reactions are usually weak or delayed. Ferments sugars without gas.
Positive results for pyrrolidonyl arylamidase, leucine aminopeptidase, hydrolysis of
aesculin in the presence of bile, hydrolysis of arginine, acid production from: glucose,
maltose & D-ribose.

Negative results for pyruvate utilization, acid production from: L-arabinose, glycerol, inulin, D-mannitol, melibiose, methyl
alpha-D-glucopyranoside, D-raffinose, D-sorbitol, L-sorbose, sucrose, D-trehalose& D-xylose.

Variable results for Voges-Proskauer reaction, hippurate hydrolysis & acidification of lactose.
Enterococcus ratti
(c) Costin Stoica
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