Description: Tryptose Phosphate Broth (TPB) used for growth of fastidious organisms. TPB promotes growth of streptococci and meningococci. The addition of 0.1% Agar concentration aids in the recovery of obligate anaerobes. Tryptose peptone and dextrose are carbon and organic nitrogen sources. Sodium Chloride aides osmolality. Disodium phosphate added as buffering agent.