 We will explore the expression of innate immune cell surface molecule expression involved in antigen presentation, phagocytic ability, and ex vivo cytokine responses in airway macrophages obtained by induced sputum. We will also collect blood to determine if ex vivo stimulation of blood mimics the inflammatory responses observed with airway macrophages. Comparisons to our past findings in vitro studies, which demonstrated that repetitive organic dust exposure impairs monocyte derived macrophage immune cell surface markers and function, could then be made. This information could lead to future investigations centered on therapeutic interventions to prevent or reverse the underlying lung disease experienced by farmers in this industry. 