What type of immunoglobulin predominates in the respiratory system?

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See a clue in the article The Immune System and immunity in swine: Mucosal immunity

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IgA predominates in the upper districts (nasal cavities, pharynx, larynx, trachea, bronchus) while in the inferior districts (bronchial and alveolar) there is mainly a systemic immune response and predominant secretion of IgG