Which of the following is the most common known primary immunodeficiency with a prevalence of 1 in 700 white individuals?

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Selective IgA deficiency is the most common (known)primary immunodeficiency and is believed to affect approximately 1 in 700 white individuals.Most cases occur sporadically.Whereas many patients show no clinical symptoms,others experience occasional respiratory infections and diarrhea.In rare cases,patients present with severe,recurrent infections that lead to permanent intestinal and airway damage,with other associated autoimmune disorders.

Which of the Following Is the Most Common Known Primary