title: Gentamicin as a selective agent for the isolation of beta haemolytic streptococci.
abstract: The isolation of beta haemolytic streptococci was compared using Columbia sheep blood agar with and without gentamicin in a final concentration of 5.5 micrograms per ml. The inclusion of gentamicin gave greatly improved results whenever the isolation of this organism in pure culture was complicated by overgrowth with Gram-negative bacilli or staphylococci.
mesh_terms: D000362:Agar; D000818:Animals; D001419:Bacteria; D001769:Blood; D005839:Gentamicins; D012703:Serotyping; D012756:Sheep; D013210:Staphylococcus; D013291:Streptococcus / Q000302:isolation & purification*
chemical_list: D005839:Gentamicins; D000362:Agar