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Bacterial loads calculated by multiplex real-time PCR (mRT-PCR) in culture-positive (n = 20) and culture-negative (n = 20) sputum specimens from patients with pneumonia. Ab, Acinetobacter baumannii; Ec, Escherichia coli; Hi, Haemophilus influenzae; Kp, Klebsiella pneumoniae; Mc, Moraxella catarrhalis; Pa, Pseudomonas aeruginosa; Sa, Staphylococcus aureus; Sp, Streptococcus pneumoniae.
