Pathogenesis of pneumonia
1. Pathogens enter the lung
2. Inflammation occurs, causing fluid buildup in the alveoli
3. Hepatization occurs—capillaries dilate, neutrophils, RBCs, and fibrin fill the alveoli
4. Blood flow decreases, WBCs and fibrin infiltrate and then consolidate
5. As the infection resolves, macrophages eliminated the consolidation