This work was supported by Foundation for Science and Technology (Fundacao para a Ciencia e Tecnologia - FCT, grant number PTDC/SAU-SAP/116563/2010) through Operational Competitiveness Programme (COMPETE) as part of the National Strategic Reference Framework.; OBJECTIVE: the aim of this study was to analyze the etiology and clinical consequences of viral respiratory infections in 18 elderly care centers (ECC) i...