Figure 2. Microbiologic characteristics of pleural fluid (PF) specimens from pediatric parapneumonic empyema (PPE) case-patients. *Streptococcus pyogenes (6), Staphylococcus aureus (3), Mycobacterium tuberculosis (2), Escherichia coli (1), Streptococcus mitis (1), Peptostreptococcus spp. (1). †Pleural fluids analyzed by PCR included 2 samples that were ply negative but wzg positive. ‡18 partially genotyped by multilocus sequence typing (MLST) (>3 alleles), as DNA concentration was too low for reliable PCR amplification and sequencing.