Keywords: elderly pneumonia etiology

        Elderly pneumonia pathogens, bacteria still accounts for a major position, than the general population of Streptococcus pneumoniae infection is low, accounting for about 40% of community-acquired 60%, followed by Haemophilus influenzae. Outside the hospital suffering from underlying diseases and nosocomial infections, Streptococcus pneumoniae infection ratio decreased, Staphylococcus aureus, Klebsiella and other gram-negative bacilli, especially Pseudomonas including Pseudomonas aeruginosa are compared with common flora. Acinetobacter Mola Ka microorganisms in the past that the non-pathogenic bacteria can cause pneumonia, often for a variety of bacteria mixed infection. Saliva containing anaerobes about 108/ml, anaerobic oral flora endogenous infection bacteria are important pathogens of aspiration pneumonia, common Fusobacterium are Bacteroides digestion cocci, Peptostreptococcus, usually for a variety of anaerobic or aerobic mixed infection. The Legionella pneumophila occur in people with underlying disease and smoking elderly. There are other viruses, Chlamydia pneumonia.