Tryptic Soy Blood Agar Base EH Difco 228200, 10Kg. Used with blood for enhanced reactions of beta-hemolytic organisms after overnight incubation and for cultivation of fastidious microorganisms. Tryptic Soy Blood Agar Base EH Difco 228200 - buy online through Voigt Global Distribution, your dealer distributor for all BBL DIFCO BD Microbiology products.