Abstract: The present invention concerns novel enrichments for enhancing the detection of the etiological agents of bacteremia. The blood enrichments of this invention are based upon the discovery that a novel supplement which includes a Fildes peptic digest of blood and certain other compounds enables conventional blood culture media to support the growth of a greater variety of microorganisms than has been possible previously and to stimulate growth rates of microorganisms. Use of the enrichment of the present invention will permit prompt and accurate detection of a broad range of etiological agents of bacteremia and facilitate the work of clinical microbiologists. The products of the invention can be utilized in antibiotic sensitivity testing, and are especially useful in automated machines for such testing.