Community-acquired legionella pneumonia in elderly patients: characteristics and outcome.

Objectives: To compare the risk factors, clinical and laboratory features, and outcome of community-acquired pneumonia (CAP) caused by Legionella pneumophila in elderly (aged > or =65) and younger patients.

Design: Prospective enrollment of subjects with retrospective data analysis.

Setting: A 630-bed tertiary center in Badalona (Barcelona), Spain.