Hektoen Enteric Agar (HE) is a selective and differential medium to isolate and differentiate Salmonella and Shigella from other Enterobacteriaceae.

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 …

Jan 4, 2022 · Principle of Hektoen Enteric Agar Hektoen enteric (HE) agar is a medium that relies on the use of bile salts for selective inhibition and two indicator systems: bromothymol blue and acid fuchsin as indicators of carbohydrate dissimilation and ferric iron as an indicator of the formation of hydrogen sulfide from thiosulfate. HE agar allows a good growth of Shigella because the inhibition of ...

Theory Hektoen enteric agar is a selective and differential media for the isolation and differentiation of enteric pathogens from clinical specimens. Animal peptones and yeast extract provide the nutritive base (Hektoen enteric agar instructions for use …

Sep 20, 2023 · Hektoen Enteric Agar (HE Agar) is a selective and differential agar medium used to isolate and differentiate enteric pathogens, particularly Salmonella and Shigella.

Hektoen Enteric Agar, Hektoen agar is a moderately selective differential medium used for the isolation and culture of gram-negative enteric microorganisms, particularly for the isolation of Shigella and Salmonella species from fecal (mixed flora) …

Remel Hektoen Enteric (HE) Agar is a solid medium recommended for use in qualitative procedures for selective and differential isolation of gram-negative enteric pathogens.

May 16, 2024 · Principle of Hektoen Enteric Agar The principle of Hektoen Enteric Agar (HE agar) lies in its selective and differential properties, which allow for the isolation and differentiation of enteric pathogens from clinical specimens.

Introduction of Hektoen Enteric Agar Hektoen enteric agar was developed in 1968 by Sylvia King and William I. Metzger in an effort to increase the recovery of Salmonella and Shigella species over the previously formulated Salmonella-Shigella (SS) Agar. This is also known as HEK and HEA. This medium is particularly useful in the isolation of Shigella species. They formulated HE Agar medium ...

Commonly used selective media for Enterobacteriaceae are MacConkey agar, xylose–lysine–deoxycholate agar, or Hektoen enteric agar. Most of these media inhibit the growth of Gram-positive and commensal organisms and differentiate between lactose fermenters and nonlactose fermenters.