Diagnostic difficulties of Lactobacillus casei bacteraemia in immunocompetent patients: A case report

被引:31
|
作者
Tommasi C. [1 ]
Equitani F. [2 ]
Masala M. [3 ]
Ballardini M. [3 ]
Favaro M. [4 ]
Meledandri M. [3 ]
Fontana C. [4 ]
Narciso P. [1 ]
Nicastri E. [1 ]
机构
[1] National Institute for Infectious Diseases, INMI 'L. Spallanzani', 00149 Rome, via portuense
[2] S. Filippo Neri General Hospital, Department of Transfusion Medicine and Hemotherapy, 00135 Rome, via Martinotti
[3] S. Filippo Neri General Hospital, 00135 Rome, via Martinotti
[4] Department of Microbiology, Polyclinic of 'Tor Vergata', 00133 Rome, viale Oxford
关键词
Lactobacillus; Moxifloxacin; Faecal Calprotectin; Lactobacillus Casei; Automate Identification System;
D O I
10.1186/1752-1947-2-315
中图分类号
学科分类号
摘要
Introduction: Lactobacilli are currently proposed as probiotic agents in several dietary products. In blood cultures, they are usually considered as contaminants, but in recent years they have been recognized as causal infectious agents of endocarditis, urinary tract infections, meningitis, intra-abdominal infections and bacteraemia. Case presentation: We report a case of Lactobacillus casei bacteraemia in a 66-year-old immunocompetent man with a history of fever of unknown origin. Leuconostoc bacteraemia was demonstrated by blood culture, but a later polymerase chain reaction analysis with sequencing of 16S ribosomal RNA identified Lactobacillus casei and a successful antibiotic therapy was performed. Conclusion: Bacteraemia caused by probiotic organisms is rare but underestimated, since they are normally regarded as contaminants and their role as primary invaders is not always easily established. Although the consumption of probiotic products cannot be considered a risk factor in the development of diseases caused by usually non-pathogenic bacteria, specific individual clinical histories should be taken into account. This report should alert both clinicians and microbiologists to the possibility of unusual pathogens causing serious illnesses and to the use of 16S ribosomal RNA sequencing for molecular identification as a powerful tool in confirming the diagnosis of infrequent pathogens. © 2008 Tommasi et al; licensee BioMed Central Ltd.
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