ID#: 8752
This 1977 photograph depicted a Petri dish filled with trypticase soy agar medium, containing 5% defibrinated sheep's blood, that had been inoculated by streaking and stabbing the medium, with non-hemolytic group A Streptococcus pyogenes (GAS) bacteria. The BAP was then incubated in a carbon dioxide enriched atmosphere at 35oC for 24-hours, and grew bacterial surface colonies with no characteristic color changes surrounding each colony, or in the stabbed areas. Under examination, no red blood cells in the blood agar medium had been altered, or hemolyzed, reflecting the non-hemolytic nature of these bacteria.
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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.