Created by
Paul A. Gulig, Ph.D.
Department of Molecular Genetics and Microbiology
with assistance from
David Brumbaugh
What has happened in this test?
B. Negative for Group A strep because both the sample and control lines reacted.
No, in a negative reaction, the sample line would be clear, but the control line would be positive. If both lines are positive, this is a definitive positive result. If the control like is negative, the test is invalid.