National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine Comparative Study sensitivity and specificity Polymerase Chain Reaction / methods* community-acquired infections / microbiology pneumonia streptococcus pneumoniae / isolation & purification* pneumococcal infections / diagnosis bacterial / diagnosis community-acquired infections / diagnosis bacterial / microbiology sputum / microbiology bronchoalveolar lavage fluid / microbiology haemophilus influenzae / isolation & purification* pmid:16626914 doi:10.1016/j.diagmicrobio.2006.01.007 madeleine kais carl spindler christian g giske moraxella catarrhalis / isolation & purification* moraxellaceae infections / diagnosis