How can lymph nodes protect against respiratory pathogens?

Lymph nodes exist through the respiratory tract and contain lymphocytes, including B and T cells. Lymphoid tissue of mucosal areas is known as Mucosal-Associated Lymphoid Tissue (MALT). Primarily found in the conducting airways In the lungs, it’s known as Bronchus-Associated Lymphoid Tissue (BALT – provides an initial line of defence through induction of IgA