has subject area Aged Aged, 80 and over Cross Infection Cross-Sectional Studies Diagnosis, Differential Disease Outbreaks Facility Design and Construction Female Homes for the Aged Humans Male Middle Aged North Carolina Nursing Homes Pneumonia, Viral Population Surveillance Predictive Value of Tests Respiratory Syncytial Virus Infections Respiratory Syncytial Viruses Respiratory Tract Infections Reverse Transcriptase Polymerase Chain Reaction Risk Factors