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Printable Version
Translations available in Spanish.
Bacitracin Sensitivity Using Group A and B Beta-Hemolytic Streptococci
Resource Type: Visual: Image
Publication Date: Prior to 1/1/2002
Figure 1

Streptococcus pyogenes and Streptoccocus agalactiae (Labeled view)
Authors
Neal Chamberlain
Department of Microbiology
Kirksville College of Osteopathic Medicine
Kirksville, Missouri 63501
USA
Email: nchamberlain@kcom.edu
The image is a 24 h culture on 5% sheep blood agar plate that has been streaked with two different beta-hemolytic streptococci. One is a group A streptococcus (S. pyogenes) the other is a group B streptococcus (S. agalactiae). This image can be used to demonstrate to students the ability to differentiate the group A beta-hemolytic streptococcus from other non-group A beta-hemolytic streptococci using sensitivity to bacitracin (Taxo A discs). It demonstrates that the group A streptococci are sensitive to bacitracin and the group B streptococci are not sensitive.

Age of culture is 24 h.