Transcript - AAP Red Book - American Academy of Pediatrics

From: Group B Streptococcal Infections
Red Book® 2015, 2015
Figure Legend:
Under a magnification of approximately 10X, this image depicts the quantitative difference in hemolytic reactivity seen in a
trypticase soy agar culture plate containing 5% sheep’s blood growing group-D Streptococci (left wedge), group-B Streptococci
(middle wedge), and group-A Streptococci (right wedge) bacteria. This plate was grown under normal atmospheric conditions, at
35oC, for a periof of 18hrs. It is important to note that the group-B Strep (GBS) center wedge, produced a hemolytic reaction that
was less than the reaction produced by the group-A Strep (GAS) in the right wedge of bacterial growth. Hemolysis is one of the
traits that is used to help identify the bacteria. Hemolysis is the destruction of the red blood cells suspended in the agar medium.
Courtesy of Centers for Disease Control and Prevention/Dr Richard Facklam
Date of download: 4/2/2017
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