Some people with a deficit of IgA exhibit recurrent respiratory tract infections. Explain this observation.?

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Some people with a deficit of IgA exhibit recurrent respiratory tract infections. Explain this observation.?

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I know that IgA is also called secretory IgA, it is found in mucus and other secretions, and it plays major role in preventing pathogens from getting into the body. But I still cannot understand how is it related to recurrent respiratory infections…. HELP please!

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