Streptococcus agalactiae

<i>Streptococcus agalactiae</i>
Fig. 16:9. Colonies of Streptococcus agalactiae, strain 09mas018883, cultivated on A, purple agar (with lactose) and B, SELMA plate (SElective MAstitis medium). The colonies are rather small on purple agar, but it is evident that this bacterium ferments lactose. The SELMA plate contains a, bovine blood agar with esculine, b, mannitol salt agar and c, Mac Conkey agar. S. agalactiae is only growing in field a, where most aerobic (and facultatively aerobic) bacteria can be grown. S. agalactiae is esculinase negative. The length of the scale bar is equivalent to 1 cm. Date: 2011-04.06.

Credit: Karl-Erik Johansson (BVF, SLU & SVA), Lise-Lotte Fernström (BVF) & Anna Eriksson (SVA).

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