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FNR medium containing fosfomycin, nalidixic acid, bovine blood and culture supernatant of Rhodococcus equi was prepared by the present authors, and the medium did not inhibit growth of Corynebacterium pseudotuberculosis but completely hampered the growth of Bacillus subtilis, Staphylococcus auyeus, and Escherichia coli. The culture supernatant of R. equi facilitated detection of suspected colonies of C.pseudotube~culosis due to synergistic hemolysis. Rate of isolation of the organisms (from the trachea, larynx and nasal cavity of 16 slaughtered sheep with caseous abscess in the lung) was higher with FNR, the selective medium, than with nonselective medium. The selective medium was thus found to be useful for isolation of C.pseudotuberculosis from sheep.:) Corresponding author. U.S.Copyright Clearance <:onrcrCode Sraccrncnt: 0931 -1793/91/3810-0743$02.50/0 ZHAO, HIRAMUNE, KIKUCHI, YANAGAWA, ITO, HATTA, SERIKAWA and YoSIKO OE Murdoch Univ., Australia 1980) the rate of isolation of C.pseudotuberculosis from the respiratory organs of sheep with caseous abscess in lung was only 56.7% with her NTP medium. This suggests that FNR medium facilitates isolation of the organisms by revealing synergistic hemolysis and inhibiting growth of bacteria other than C. pseudotuberculosis.

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