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Hektoen Enteric Agar (HE)

Hektoen enteric agar (HE) is a selective and differential agar primarily used to recover Salmonella and Shigella from patient specimens. HE contains indicators of lactose fermentation and hydrogen sulfide production; as well as inhibitors to prevent the growth of Gram-positive bacteria. 

Enzymatic Digest of Animal Tissue 16.5g

Yeast Extract 3g

Bile Salts Mixture 4.5g

Lactose 12g

Sucrose 12g

Salicin 2g

Sodium Chloride 5g

Sodium Thiosulfate 5g

Ferric Ammonium Citrate 1.5g

Bromthymol Blue 0.065g

Acid Fuchsin 0.1g

Agar 13.5g

Final pH: 7.5 ± 0.2 at 25°C

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