| Cultures (sputum, blood, transthoracic needle aspirate, transbronchial aspirates, BAL fluid, protected specimen brush respiratory samples, pleural fluid), serologic testing (for M. pneumoniae, C. pneumoniae, L. pneumophila, C. burnetti, influenza A and B, parainfluenza viruses 1 to 3, respiratory syncytial virus, adenovirus), urinary antigen testing (for S. pneumoniae and L. pneumophila), immunofluorescence assay plus virus isolation or reverse transcriptase PCR for influenza A and B, parainfluenza viruses 1 to 3, respiratory syncytial virus, adenovirus | Cultures (sputum, blood), serologic testing (for M. pneumoniae, C. pneumoniae) | Cultures (sputum, blood, transthoracic needle aspirate, transbronchial aspirates, BAL fluid, protected specimen brush respiratory samples, pleural fluid), serologic testing (for M. pneumoniae, C. pneumoniae, L. pneumophila, C. burnetti, influenza A and B, parainfluenza viruses 1 to 3, respiratory syncytial virus, adenovirus), urinary antigen testing (for S. pneumoniae and L. pneumophila), immunofluorescence assay plus virus isolation or reverse transcriptase PCR for influenza A and B, parainfluenza viruses 1 to 3, respiratory syncytial virus, adenovirus | Cultures (blood, endotracheal aspirates, protected specimen brush respiratory samples, BAL fluid, pleural fluid), urinary antigen (for L. pneumophila) | Cultures (sputum, blood, transthoracic needle aspirate, transbronchial aspirates, BAL fluid, protected specimen brush respiratory samples, pleural fluid), serologic testing (for M. pneumoniae, C. pneumoniae, L. pneumophila, C. burnetti, influenza A and B, parainfluenza viruses 1 to 3, respiratory syncytial virus, adenovirus), urinary antigen testing (for S. pneumoniae and L. pneumophila), immunofluorescence assay plus virus isolation or reverse transcriptase PCR for influenza A and B, parainfluenza viruses 1 to 3, respiratory syncytial virus, adenovirus | Cultures (blood, endotracheal aspirates, protected specimen brush respiratory samples, BAL fluid, pleural fluid), urinary antigen testing (for L. pneumophila) |