A 65-year old woman presents with a 3-day history of productive cough, fever, and shortness of breath. Her temperature is 38C. An x-ray film of the chest shows consolidation of both lungs, and sputum cultures are postive for streptococcus pneumoniae. Which of the following terms best describes the primary function of inflammatory cells in this pateint's alveolar air spaces?
Fibrinolysis
Cell-mediated immuity
Antibody production
Phagocytosis
Histamine release