OBJECTIVE To research the composition of pathogenic microorganisms in elderly patients with lower respiratory tract infections and its drug resistance to antimicrobial agents,so as to provide help for rational clinical use of antibiotics.METHODS A retrospective analysis of sputum was conducted to identify pathogenic bacteria and drug sensitivity in elderly patients with lower respiratory tract infections from Jan.2010 to Dec.2013 in our hospital.WHONET 5.6was explored to make statistical analysis.RESULTS Du...