title: Why are the elderly so susceptible to pneumonia?
authors.forename: Shirin
authors.initials: S
authors.lastname: Birjandi
authors.forename: Pamela
authors.initials: P
authors.lastname: Witte
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging / Q000276:immunology; D017714:Community-Acquired Infections / Q000209:etiology* / Q000276:immunology / Q000382:microbiology; D004198:Disease Susceptibility; D006801:Humans; D008168:Lung / Q000276:immunology / Q000382:microbiology; D010587:Phagocytosis; D011018:Pneumonia, Pneumococcal / Q000209:etiology* / Q000276:immunology / Q000382:microbiology; D018570:Risk Assessment; D012307:Risk Factors; D013154:Spleen / Q000276:immunology / Q000382:microbiology; D013296:Streptococcus pneumoniae / Q000276:immunology / Q000472:pathogenicity*; D013601:T-Lymphocytes / Q000276:immunology / Q000382:microbiology