Created by
Paul A. Gulig, Ph.D.
Department of Molecular Genetics and Microbiology
with assistance from
David Brumbaugh
What test do you do next?
C. Bacitracin (A
disk)
Yes, this test is used to differentiate beta-hemolytic streptococci - Streptococcus pyogenes (Group A strept) from other beta-hemolytic streptococci that sometimes cause disease such as Group B strep (S. agalactiae). There is another choice of culture-based tests that is more appropriate today. There is also a rapid test that could be used. Pick that test out, too.
Here is what the bacitracin test would have looked like:
