Which medias are enriched?

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Multiple Choice

Which medias are enriched?

Enriched media provide extra nutrients that support the growth of fastidious organisms. Chocolate agar (CHOC) is made by lysing red blood cells, which releases NAD (Factor V) and heme (X); these nutrients are essential for many fastidious bacteria, so CHOC is considered enriched. Blood agar plates (BAP) with whole blood supply additional growth factors from the blood, making them enriched as well and they’re also differential by hemolysis patterns. MacConkey agar (MAC) is not enriched; it’s selective for Gram-negative bacteria due to bile salts and crystal violet and differentiates lactose fermenters. Columbia CNA with 5% sheep blood (CNA O2) is selective for Gram-positive cocci due to antibiotics in the medium and is not an enriched medium. So the media that are enriched are CHOC and BAP, making the combination CHOC, BAP the best choice.

Enriched media provide extra nutrients that support the growth of fastidious organisms. Chocolate agar (CHOC) is made by lysing red blood cells, which releases NAD (Factor V) and heme (X); these nutrients are essential for many fastidious bacteria, so CHOC is considered enriched. Blood agar plates (BAP) with whole blood supply additional growth factors from the blood, making them enriched as well and they’re also differential by hemolysis patterns.

MacConkey agar (MAC) is not enriched; it’s selective for Gram-negative bacteria due to bile salts and crystal violet and differentiates lactose fermenters. Columbia CNA with 5% sheep blood (CNA O2) is selective for Gram-positive cocci due to antibiotics in the medium and is not an enriched medium.

So the media that are enriched are CHOC and BAP, making the combination CHOC, BAP the best choice.

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