Characteristics of Streptococcus pseudopneumoniae Isolated from Purulent Sputum Samples

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ID: 111935
2006
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Abstract
Streptococcus pseudopneumoniae is a recently described streptococcus that is phenotypically and genetically distinct from Streptococcus pneumoniae and other viridans streptococci. Key characteristics of S. pseudopneumoniae are the absence of a pneumococcal capsule, insolubility in bile, resistance or indeterminate susceptibility to optochin when incubated in 5% CO2 but susceptibility to optochin when incubated in ambient air, and a positive reaction with the AccuProbe DNA probe hybridization test. The clinical importance of this bacterium is currently unknown. We report the characteristics and associated clinical data of 35 strains of S. pseudopneumoniae isolated from sputum samples from 33 patients. All isolates produced a positive result with the NOW S. pneumoniae antigen test (Binax, Inc.). No isolate was resistant to penicillin, but 60% were resistant to erythromycin and 77% were resistant to tetracycline. All patients had lower respiratory tract symptoms, 79% had chronic obstructive pulmonary disease (COPD), and 33% had chest radiographic infiltrates. Compared with matched control patients who had Streptococcus pneumoniae isolated from sputum, patients with S. pseudopneumoniae infection were more likely to have a history of COPD (odds ratio [OR], 5.0; 95% confidence interval [CI], 1.67 to 20.11) or exacerbation of COPD (OR, 6.5; 95% CI, 2.61 to 16.20). Further research is needed to better characterize the epidemiology of S. pseudopneumoniae colonization and the role of S. pseudopneumoniae in COPD and other diseases.
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Authors Elaine R. Keith;Roslyn G. Podmore;Trevor P. Anderson;David R. Murdoch;Elaine R. Keith;Roslyn G. Podmore;Trevor P. Anderson;David R. Murdoch;
Journal Journal of clinical microbiology
Year 2006
DOI
10.1128/JCM.44.3.923-927.2006
URL
http://dx.doi.org/10.1128/JCM.44.3.923-927.2006
Keywords
National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine adult female male adolescent aged middle aged 80 and over Bacterial phenotype drug resistance respiratory tract infections / complications streptococcal infections / microbiology* streptococcus / isolation & purification* streptococcal infections / complications sputum / microbiology* respiratory tract infections / microbiology* streptococcus / drug effects david r murdoch pmid:16517877 pmc1393130 doi:10.1128/jcm.44.3.923-927.2006 elaine r keith roslyn g podmore pulmonary disease chronic obstructive / complications streptococcus / classification streptococcus / pathogenicity

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