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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 regarding IgA is not true?

A
Complement fixation tests for IgA antibody will be positive if specific IgA antibody is present
B
IgA is not found in saliva, therefore an IgA diagnostic test on saliva would have no value
C
IgA can be destroyed by bacterial proteases
D
IgA is absent in colostrum
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