Having received no prenatal care, a young woman arrives at a hospital after many hours of...
Having received no prenatal care, a young woman arrives at a hospital after many hours of labor and delivers a baby girl. Three days later the baby girl is listless, nursing poorly, and is running a fever. Blood cultures are done, and after 24 hours, they are Gram stained and show the presence of gram-positive cocci in pairs and short chains. Upon subculture, these form colonies that are beta hemolytic on blood agar. Further tests demonstrate that the isolate is catalase negative, resistant to bacitracin, and is CAMP test positive. What is the identification of this organism?
Homework Answers
ANSWER:
This organism is Streptococcus agalactiae (also known as Group B Streptococcus).
As it is mentioned they are gram-positive cocci in pairs and form short chains. This identified these are Streptococcus.
Further subculture demonstrate that these are beta hemolytic, catalase negative and resistant to bacitracin.
Finally CAMP test allows us to distinguish between the different beta hemolytic Streptococcus groups.
The positive CAMP test Identifies the presence of Streptococcus agalactiae.
Streptococcus agalactiae lead to the bacterial sepsis, pneumonia, and meningitis in newborns.
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