Lung/immunology; Lung/microbiology; Membrane Glycoproteins/antagonists & inhibitors; Membrane Glycoproteins/pharmacology; Pneumonia, Pneumococcal/immunology; Streptococcus pneumoniae/immunology; fas Receptor/physiology; Amino Acid Substitution; Animals; Apoptosis; Bronchoalveolar Lavage Fluid/cytology; Chemokine CXCL2; Colony Count, Microbial; Disease Models, Animal; Fas Ligand Protein; Lung/pathology; Macrophages/immunology; Male; Membrane Glycoproteins/administration & dosage; Membrane Glycoproteins/analysis; Membrane Glycoproteins/genetics; Mice; Mice, Inbred C57BL; Mice, Knockout; Monokines/analysis; Mutation; Phagocytosis; Receptors, Cell Surface/administration & dosage; Receptors, Cell Surface/genetics; Receptors, Tumor Necrosis Factor; Receptors, Tumor Necrosis Factor, Member 6b; Spleen/microbiology; Streptococcus pneumoniae/isolation & purification; Tumor Necrosis Factor-alpha/analysis; fas Receptor/genetics