Overview and Objectives
Main Topic
Subtopic 1:
Beta-hemolytic Streptococci
1.1, 1.2, 1.3
  Subtopic 1 Summary
Subtopic 2: Alpha-hemolytic streptococci
  Activity 2
  Subtopic 2 Summary
Subtopic 3: Gamma Streptococci
3.1, 3.2
  Subtopic 3 Summary
Module Summary

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Subtopic 3 Summary

The group D streptococci are associated with urinary tract infections, endocarditis, and septicemia. The group D streptococci are bile-esculin positive but are not salt tolerant. Streptococcus bovis is a member of the group D streptococci.

What two tests are incorporated into the bile esculin test?

Case Study Discussion

An ambulatory patient with a temperature of 101°F and painful urination visits her physician. He orders a urine culture. The specimen is plated on blood agar and MacConkey agar. At 24 hours' incubation, flat, gray, non-hemolytic colonies are observed on the blood agar plate. No growth on MacConkey. Bile-esculin was positive for growth with black precipitate. What other tests should be performed? What organisms are suspected?