Identification of lactic acid bacteria isolated from blood samples and their susceptibility to antibiotics

ŠEVČÍKOVÁ, Alena, Pavel ŠVEC, Marc VANCANNEYT, Jean SWINGS and Ivo SEDLÁČEK. Identification of lactic acid bacteria isolated from blood samples and their susceptibility to antibiotics. In 15th European Congress of Clinical Microbiology and Infectious Disease. Clin Microbiol Infect, Suppl. 2. 2005.

Basic information

• Original name: Identification of lactic acid bacteria isolated from blood samples and their susceptibility to antibiotics
• Name in Czech: Identifikace laktobacilů izolovaných z hemokultur a jejich citlivost k antibiotikům
• Name (in English): Identification of lactic acid bacteria isolated from blood samples and their susceptibility to antibiotics
• Authors: ŠEVČÍKOVÁ, Alena (203 Czech Republic), Pavel ŠVEC (203 Czech Republic), Marc VANCANNEYT (56 Belgium), Jean SWINGS (56 Belgium) and Ivo SEDLÁČEK (203 Czech Republic, guarantor).
• Edition: 15th European Congress of Clinical Microbiology and Infectious Disease. Clin Microbiol Infect, Suppl. 2. 2005.

Other information

• Original language: Czech
• Type of outcome: Conference abstract
• Field of Study: 10600 1.6 Biological sciences
• Country of publisher: Denmark
• Confidentiality degree: is not subject to a state or trade secret
• RIV identification code: RIV/00216224:14310/05:00013114
• Organization unit: Faculty of Science
• Keywords in English: Lactic acid bacteria; identification; susceptibility
• Tags: identification, lactic acid bacteria, susceptibility

Abstract

Objectives: Since the 1980s members of lactococci, pediococci, leuconostocs and lactobacilli have rarely been indicated as opportunistic pathogens in humans. Generally, these taxa are part of the normal intestinal flora and occur in fermented foods and on plants. Due to their low virulence it is assumed that these bacteria are pathogenic only in immunocompromised hosts. Their sporadic occurrence in human clinical samples is often overlooked and/or they are misidentified. Methods: A total of 59 845 blood samples were isolated at the Department of Clinical Microbiology (Teaching Hospital, Brno, Czech Republic) during the 2000 – 2003. Biochemical identification was performed on selected LAB by API 50 CH kit and by conventional tests. (GTG)5- PCR fingerprinting and whole cell protein profile analysis by SDS-PAGE were performed to confirm the biochemical identification results. The MICs for antimicrobial agents (benzylpenicillin, ampicilin, cefotaxim, imipenem, erytromycin, clindamycin, gentamicin, ciprofloxacin, cotrimoxazol, metronidazol, vancomycin and teikoplanin) were determined by using the E-test MIC (Biodisk, Solna, Sweden). Results: A total of 59.845 investigated blood samples yielded 12.767 (21.3%) infected hemocultures of which 33 (0.25%) contained LAB. They were identified based on phenotypical testing as Lactobacillus plantarum (3 strains), Lactobacillus rhamnosus (7), Lactobacillus paracasei ssp. paracasei (2), Lactobacillus salivarius ssp. salivarius (1), Lactobacillus fermentum (1), Leuconostoc mesenteroides (9), Leuconostoc lactis (5) and Pediococcus pentosaceus (1). The (GTG)5- PCR fingerprinting and whole cell protein profile analysis confirmed above identifications and furthermore identified four strains which were biochemically classified at the genus level as Lactobacillus sakei ssp. carnosus, Lactobacillus curvatus, Leuconostoc pseudomesenteroides and Weissella confusa. All investigated strains (19) were resistant to vancomycin, teicoplanin and metronidazol and most of them to cotrimoxazol. Susceptibility to cefotaxim, imipenem, gentamicin and ciprofloxacin was variable. Conclusion: Lactobacillus rhamnosus and Leuconostoc mesenteroides were the most common LAB species isolated from blood samples. Although isolation of LAB from blood samples is rare, it is of clinical significance and it should be taken into account during treatment decision - especially when they are isolated in pure culture from sterile sites.

Abstract (in English)

Objectives: Since the 1980s members of lactococci, pediococci, leuconostocs and lactobacilli have rarely been indicated as opportunistic pathogens in humans. Generally, these taxa are part of the normal intestinal flora and occur in fermented foods and on plants. Due to their low virulence it is assumed that these bacteria are pathogenic only in immunocompromised hosts. Their sporadic occurrence in human clinical samples is often overlooked and/or they are misidentified. Methods: A total of 59 845 blood samples were isolated at the Department of Clinical Microbiology (Teaching Hospital, Brno, Czech Republic) during the 2000 – 2003. Biochemical identification was performed on selected LAB by API 50 CH kit and by conventional tests. (GTG)5- PCR fingerprinting and whole cell protein profile analysis by SDS-PAGE were performed to confirm the biochemical identification results. The MICs for antimicrobial agents (benzylpenicillin, ampicilin, cefotaxim, imipenem, erytromycin, clindamycin, gentamicin, ciprofloxacin, cotrimoxazol, metronidazol, vancomycin and teikoplanin) were determined by using the E-test MIC (Biodisk, Solna, Sweden). Results: A total of 59.845 investigated blood samples yielded 12.767 (21.3%) infected hemocultures of which 33 (0.25%) contained LAB. They were identified based on phenotypical testing as Lactobacillus plantarum (3 strains), Lactobacillus rhamnosus (7), Lactobacillus paracasei ssp. paracasei (2), Lactobacillus salivarius ssp. salivarius (1), Lactobacillus fermentum (1), Leuconostoc mesenteroides (9), Leuconostoc lactis (5) and Pediococcus pentosaceus (1). The (GTG)5- PCR fingerprinting and whole cell protein profile analysis confirmed above identifications and furthermore identified four strains which were biochemically classified at the genus level as Lactobacillus sakei ssp. carnosus, Lactobacillus curvatus, Leuconostoc pseudomesenteroides and Weissella confusa. All investigated strains (19) were resistant to vancomycin, teicoplanin and metronidazol and most of them to cotrimoxazol. Susceptibility to cefotaxim, imipenem, gentamicin and ciprofloxacin was variable. Conclusion: Lactobacillus rhamnosus and Leuconostoc mesenteroides were the most common LAB species isolated from blood samples. Although isolation of LAB from blood samples is rare, it is of clinical significance and it should be taken into account during treatment decision - especially when they are isolated in pure culture from sterile sites.

Links

• GA301/02/1505, research and development project: Name: Molekulární diagnostika, epidemiologie a klasifikace klinicky významných grampozitivních koků

Investor: Czech Science Foundation, Molecular diagnostic, epidemiology and classification of pathogenic Gram positive cocci

• MSM0021622416, plan (intention): Name: Diverzita biotických společenstev a populací: kauzální analýza variability v prostoru a čase

Investor: Ministry of Education, Youth and Sports of the CR, Diversity of Biotic Communities and Populations: Causal Analysis of variation in space and time