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Microbiology
Of the five immunoglobulin classes, IgA is the main immunoglobulin of secretions from the genital, respiratory, and intestinal tracts. As a result, IgA antibody is the first line of defense against infections at the mucous membrane. It is usually an early specific antibody. Which of the following statements most accurately describes IgA?
Complement fixation tests for IgA antibody will be positive if specific IgA antibody is present
IgA can be destroyed by bacterial proteases
IgA is absent in colostrum
IgA is not found in saliva; therefore, an IgA diagnostic test on saliva would have no value
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