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- W2317661410 abstract "To the Editor: We concur the findings published in Pediatric Critical Care Medicine of Dr. Levin and colleagues (1), who found a 30% to 40% incidence of bacterial coinfection/concomitant bacterial pneumonia (CBP) in 23 “low-risk” infants ventilated for respiratory syncytial virus (RSV). Since our original prospective study covering the 2002–2005 period (2), we have continued to employ the strategy advocated by Dr. Levin and colleagues (1) and supported by Dr. Yogev in his accompanying editorial (3)—that is, perform tracheobronchial sampling on admission, use empirical antibiotics, and conduct a review/rationalization 48–72 hrs later once bacteriology culture results are available. Of 352 children ventilated for RSV infection between 2002 and 2009 (total number = 384, less 32 as no admission broncho-alveolar lavage was performed; median age 2.8 months, interquartile range 1.3–11.5 months), bacterial coinfection was found in up to 36%, with 18% (n = 72) having CBP and 18% “possible” bacterial coinfection (n = 73). We found no difference in the bacterial coinfection/CBP incidence between low-risk RSV patients and those with comorbidity (37% vs. 36%; Fisher's exact test, p = .9). We would challenge the clinical relevance in differentiating the two groups. Our diagnosis of bacterial coinfection/CBP or possible CBP (low bacterial growth) is based on pure growth densities (>105 colony-forming units/mL) plus leukocytes in the broncho-alveolar lavage. It is therefore similar, but microbiologically stronger, than the definitions utilized by Dr. Levin and colleagues (1) and Randolph et al (4). It also fulfils the call of Dr. Yogev (3) for quantitation or semiquantitation to increase specificity and overcomes his concerns of “the inherent problem of bacterial contamination.” A pure growth of a single species of >105 colony-forming units/mL plus a leukocyte count >100 × 106/L in the broncho-alveolar lavage qualifies for CBP, and a lower bacterial growth density or leukocyte count represents possible bacterial coinfection (2). The potential bacterial pathogens (CBP + possible) were as follows: Haemophilus influenzae, 52; Staphylococcus aureus, 38; Moraxella catarrhalis, 31; Streptococcus pneumoniae, 22; Pseudomonas, 16; Escherichia coli, six; Klebsiella, five; Enterobacter, five; methicillin-resistant S.aureus, four; Stenotrophomonas, three; S. agalactiae, two; Bordetella pertussis, two; Streptococcus group C, one, and Pneumocystis jirovecii, one. Thirty-five children had two bacteria cultured, and eight had more than two species. Contrary to skeptical criticism, it is difficult to believe that a heavy pure growth of a potential bacterial pathogen deep in a “virgin” tracheobronchial tree has been pushed down by recent intubation. Like Dr. Levin and colleagues (1), we too found total white cell, neutrophil or lymphocyte counts, and C-reactive protein unhelpful in differentiating CBP from RSV-only infection (all Mann-Whitney-Wilcoxon tests p > .2). Once again compared with the RSV-only group, the CBP group had a longer duration of ventilation (median 6 days, interquartile range 3.5–9 days vs. 5 days, 3–7.5 days; Mann-Whitney-Wilcoxon test, p = .03). Mortality continued to be similar in both groups (CBP 4.8% vs. RSV-only 5.6%; Fisher's exact test, p = .8). Based on our data plus those of other authors (1, 2, 4–6), we continue to employ and advocate the strategy of tracheobronchial sampling on intubation or pediatric intensive care unit admission, empirical antibiotic cover (cefotaxime), and then review/rationalization with microbiological results in this vulnerable patient group. The authors have not disclosed any potential conflicts of interest. Kentigern Thorburn, MD, FCPaed Nayan Shetty, MD Andrew P. Darbyshire, MSc Paediatric Intensive Care Unit, Alder Hey Children's Hospital, Liverpool, United Kingdom" @default.
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- W2317661410 date "2011-01-01" @default.
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- W2317661410 title "Concomitant bacterial pneumonia and empirical antibiotics in severe respiratory syncytial virus infection" @default.
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