Silica exposure increases the risk of which infection due to macrophage dysfunction?

Prepare for the Respiratory CAS Exam with comprehensive quizzes. Utilize flashcards and multiple choice questions, each crafted with detailed explanations and hints. Equip yourself for success in your test!

Silica exposure damages alveolar macrophages, which are crucial for controlling Mycobacterium tuberculosis. When these macrophages are impaired, their ability to phagocytose and kill intracellular bacteria and to form effective granulomas is reduced. TB control relies heavily on macrophage-mediated killing and coordinated cell-mediated immunity, so silica-induced macrophage dysfunction markedly increases the risk of tuberculosis infection and reactivation of latent TB. While silica exposure can contribute to other lung issues, the strongest link is with TB due to the central role of macrophages in containing Mycobacterium tuberculosis.