Hektoen enteric agar
Selective and differential agar / From Wikipedia, the free encyclopedia
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Hektoen enteric agar (HEK, HE or HEA) is a selective and differential agar[1] primarily used to recover Salmonella and Shigella from patient specimens. HEA contains indicators of lactose fermentation and hydrogen sulfide production; as well as inhibitors to prevent the growth of Gram-positive bacteria. It is named after the Hektoen Institute in Chicago, where researchers developed the agar.