ID#: 8177
This 1977 image depicts a Petri dish filled with trypticase soy agar medium containing 5% defibrinated sheep's blood. After having been inoculated with alpha-hemolytic, Streptococcus anginosus bacteria, a member of the Gram-positive viridans group of streptococci (VGS), the blood agar plate (BAP) was incubated in a carbon dioxide enriched atmosphere at 35oC for 24-hours. The culture grew numbers of surface bacterial colonies. The characteristic color changes, including a light colored halo surrounding each colony, indicated that these bacteria were alpha-hemolytic in nature.
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Content Provider(s): CDC/ Richard R. Facklam, Ph.D.
Creation Date: 1977
Photo Credit:
CDC Organization
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.