<unk>  (HEK, HE or<unk>  is a selective and differential<unk>  primarily used to recover Salmonella and Shigella from patient specimens.<unk>  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<unk>  Institute in Chicago, where researchers developed the<unk> .
Hektoen enteric agar
Löwenstein–Jensen medium
Phosphotungstic acid-haematoxylin stain
Luxol fast blue stain
Giemsa stain
Leishman stain
PAS diastase stain
Auramine phenol stain