A positive complement-fixation test is indicated by the lysis of the sheep red blood cells added in the indicator phase of the test.

Name: A positive complement-fixation test is indicated by the lysis of the sheep red blood cells added in the indicator phase of the test.
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A positive complement-fixation test is indicated by the lack of lysis of the sheep red blood cells, as the complement is used up in the antigen-antibody reaction and is not available to lyse the indicator red blood cells.

A Positive Complement-Fixation Test Is Indicated by the Lysis of the Sheep