Brain-Heart Infusion Broth is used for the cultivation of a wide variety of fastidious organisms.|Rosenow1 prepared a rich medium for culturing streptococci by combining dextrose broth and brain tissue. Hayden2 modified the original formula while working with dental pathogens. The current formula is a modification of Rosenow1 and Hayden2, using dehydrated infusions of porcine brain and heart tissue. Brain-Heart Infusion Broth can be supplemented with antibiotics, varying amounts of sodium chloride, yeast extract, and serum to provide a rich medium for bacteria, yeasts and pathogenic fungi.3 The addition of 0.1% agar can be used to lower oxygen tension, providing an atmosphere to support the growth of aerobic, microaerophilic, and obligate anaerobic microorganisms. Brain-Heart Infusion Broth, abbreviated as BHI, is specified in many references for food and water testing.4-7 NCCLS, National Committee for Clinical Laboratory Standards, cites Brain-Heart Infusion Broth for preparing the inoculum used in antimicrobial susceptibility tests.8||The nitrogen, vitamin, and carbon sources are provided by Brain-Heart Infusion and enzymatic digest of gelatin in BHI Broth. Dextrose is the carbohydrate source, and sodium chloride maintains the osmotic environment. Disodium phosphate is the buffering agent in this medium.||Note: |Both dextrose and sodium chloride have been removed in order to allow the researcher to control the experimental conditions.||Appearance:|Yellow to beige, free flowing, homogenous powder||Solubility:|Aamber to clear, complete with heating.||pH:|6.5-7.5||Growth Supporting Properties:|Peptone Agar (2%):|E. coli ATCC 25922: good to excellent recovery|S. aureus ATCC 25923: fair to good recovery||Country of Origin:|Brain: Porcine, USA|Heart: Porcine, USA||Important Note: This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.