Category: medical

Hektoen Enteric (HE) Agar: Introduction, Composition, Principle, Procedure, Results Interpretation, Uses and Limitations

Hektoen Enteric (HE) Agar:Hektoen Enteric (HE) Agar 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 while working at the Hektoen Institute in Chicago and became able to  increase the recovery Salmonella and Shigella from clinical specimens. It is also a selective and differential medium used for the isolation and differentiation of gram-negative enteric pathogens. Introduction of Hektoen Enteric (HE) Agar Hektoen enteric (HE) agar was...

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Sorbitol MacConkey Agar (SMAC): Introduction, Composition, Principle, Procedure, Results Interpretation, Uses and Limitations

Sorbitol MacConkey Agar (SMAC) is recommended for isolation of E. coli O157:H7. Rappaport and Henig first described the formulation of the medium, and it was later confirmed by March and Ratham who reported MacConkey Introduction of Sorbitol MacConkey Agar (SMAC) Sorbitol MacConkey Agar (SMAC) is...

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Salmonella-Shigella (SS) Agar: Introduction, Composition, Principle, Procedure, Results Interpretation, Uses and Limitations

Salmonella-Shigella (SS) Agar is recommended for use as a selective and differential medium for the isolation of Salmonella and some Shigella species from clinical and non-clinical specimens( suspected foodstuffs). Introduction of Salmonella-Shigella (SS) Agar Salmonella-Shigella (SS) Agar is recommended for...

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