Tryptone Soya Yeast Extract Agar, Modified

Tryptone Soya Yeast Extract Agar, Modified is recommended for confirmation of Listeria and Yersinia in accordance with FDA BAM, 1998. This medium is recommended for the isolation and cultivation of L. monocytogenes and Yersinia from foods in accordance with FDA BAM, 1998. Food samples with suspected Listerial or Yersinial contamination are processed for the bacterial isolation using respective selective agars. Purification of isolated colonies on this medium is a mandatory step in the conventional analysis because isolated colonies on selective agar media may still be in contact with an invisible weak background of partially inhibited competitors.