Description : PEA is recommended for the selective isolation of gram positive cocci from clinical specimens or from mixed population of gram negative and gram positive flora. Phenylethanol agar with sheep blood is a selective media developed by Brewer and Lilley. The addition of phenylethanol to the basal nutritive media permits the growth of gram positive organisms (particularly cocci) while inhibiting most gram negative organisms, especially the swarming of proteus species. Most gram negative organisms will