Sheep blood agar

Definition

Sheep blood agar is a nutrient-rich medium used to cultivate a wide variety of microorganisms and to detect hemolytic activity. It contains 5% sheep blood, which provides essential growth factors for bacteria.

5 Must Know Facts For Your Next Test

1. Sheep blood agar is used to identify bacterial species based on their hemolytic properties.
2. It supports the growth of most fastidious organisms due to its nutrient-rich composition.
3. Hemolysis on sheep blood agar can be categorized as alpha (partial), beta (complete), or gamma (none).
4. This medium helps differentiate between pathogenic and non-pathogenic strains of bacteria like Streptococcus.
5. Sheep blood agar plates must be incubated in conditions appropriate for the oxygen requirements of the microorganisms being cultured.

Review Questions

Related terms

Hemolysis:

The breakdown of red blood cells, often observed as clear zones around colonies on sheep blood agar.

Fastidious Organisms: Bacteria that require special nutritional or environmental conditions for growth.

Streptococcus:

A genus of coccus-shaped bacteria, some species of which are identified using hemolytic patterns on sheep blood agar.