L Sarelli

Summary

Affiliation: University of Helsinki
Country: Finland

Publications

  1. ncbi request reprint Genome analysis of Campylobacter jejuni strains isolated from a waterborne outbreak
    Joana Revez
    Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P, O, Box 66, Agnes Sjöberginkatu 2, Helsinki FI 00014, Finland
    BMC Genomics 15:768. 2014
  2. pmc Comparative genomics of unintrogressed Campylobacter coli clades 2 and 3
    Caroline P A Skarp-de Haan
    Department of Food Hygiene and Environmental Health, Helsinki University, Helsinki, Finland
    BMC Genomics 15:129. 2014
  3. pmc Contingency nature of Helicobacter bizzozeronii oxygen-insensitive NAD(P)H-nitroreductase (HBZC1_00960) and its role in metronidazole resistance
    Pradeep Kumar Kondadi
    Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P, O, Box 66, Agnes Sjöbergin katu 2, FI 00014, Helsinki, Finland
    Vet Res 44:56. 2013
  4. pmc Multilocus sequence types of Finnish bovine Campylobacter jejuni isolates and their attribution to human infections
    Caroline P A de Haan
    Department of Food Hygiene and Environmental Health, University of Helsinki, Agnes Sjöberginkatu, Helsinki, Finland
    BMC Microbiol 10:200. 2010
  5. pmc Comparative genomics of Helicobacter pylori and the human-derived Helicobacter bizzozeronii CIII-1 strain reveal the molecular basis of the zoonotic nature of non-pylori gastric Helicobacter infections in humans
    Thomas Schott
    Department of Food Hygiene and Environmental Health DFHEH, Faculty of Veterinary Medicine, University of Helsinki, P, O, Box 66, FI 00014 University of Helsinki, Finland
    BMC Genomics 12:534. 2011
  6. pmc A longitudinal study of Campylobacter distribution in a turkey production chain
    Päivikki Perko-Mäkelä
    Finnish Food Safety Authority Evira, Research Department, Production Animal Health, Seinajoki, Finland
    Acta Vet Scand 51:18. 2009
  7. ncbi request reprint Spontaneous mutation frequency and emergence of ciprofloxacin resistance in Campylobacter jejuni and Campylobacter coli
    Marja Liisa Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    J Antimicrob Chemother 60:1251-7. 2007
  8. pmc Typing of human Campylobacter jejuni isolates in Finland by pulsed-field gel electrophoresis
    M L Hänninen
    Department of Food and Environment Hygiene, Faculty of Veterinary Medicine, Helsinki University, Finland
    J Clin Microbiol 36:1787-9. 1998
  9. ncbi request reprint Extension of the species Helicobacter bilis to include the reference strains of Helicobacter sp. flexispira taxa 2, 3 and 8 and Finnish canine and feline flexispira strains
    M L Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, Helsinki University, PO Box 66, FI 00014 Helsinki, Finland
    Int J Syst Evol Microbiol 55:891-8. 2005
  10. ncbi request reprint Helicobacter sp. flexispira 16S rDNA taxa 1, 4 and 5 and Finnish porcine Helicobacter isolates are members of the species Helicobacter trogontum (taxon 6)
    Marja Liisa Hänninen
    Faculty of Veterinary Medicine, Department of Food and Environmental Hygiene, PO Box 57, 00014 Helsinki University, Finland
    Int J Syst Evol Microbiol 53:425-33. 2003

Collaborators

Detail Information

Publications36

  1. ncbi request reprint Genome analysis of Campylobacter jejuni strains isolated from a waterborne outbreak
    Joana Revez
    Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P, O, Box 66, Agnes Sjöberginkatu 2, Helsinki FI 00014, Finland
    BMC Genomics 15:768. 2014
    ..jejuni strains (one isolated from water and two from patients) from an earlier resolved Finnish waterborne outbreak from the year 2000...
  2. pmc Comparative genomics of unintrogressed Campylobacter coli clades 2 and 3
    Caroline P A Skarp-de Haan
    Department of Food Hygiene and Environmental Health, Helsinki University, Helsinki, Finland
    BMC Genomics 15:129. 2014
    ..coli clades 2 and 3, using comparative genomics and with additional genome sequences available, to investigate the impact of horizontal gene transfer in shaping the accessory and core gene pools in unintrogressed C. coli...
  3. pmc Contingency nature of Helicobacter bizzozeronii oxygen-insensitive NAD(P)H-nitroreductase (HBZC1_00960) and its role in metronidazole resistance
    Pradeep Kumar Kondadi
    Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P, O, Box 66, Agnes Sjöbergin katu 2, FI 00014, Helsinki, Finland
    Vet Res 44:56. 2013
    ..bizzozeronii rdxA appears to be a contingency gene which undergoes phase variation. The contingency nature of rdxA should be carefully considered when metronidazole is used in the treatment of H. heilmannii-associated gastritis. ..
  4. pmc Multilocus sequence types of Finnish bovine Campylobacter jejuni isolates and their attribution to human infections
    Caroline P A de Haan
    Department of Food Hygiene and Environmental Health, University of Helsinki, Agnes Sjöberginkatu, Helsinki, Finland
    BMC Microbiol 10:200. 2010
    ..Here, we analysed the population structure of a total of 250 Finnish C. jejuni isolates from bovines, poultry meat and humans collected in 2003 using a combination of Bayesian clustering (BAPS software) and phylogenetic analysis...
  5. pmc Comparative genomics of Helicobacter pylori and the human-derived Helicobacter bizzozeronii CIII-1 strain reveal the molecular basis of the zoonotic nature of non-pylori gastric Helicobacter infections in humans
    Thomas Schott
    Department of Food Hygiene and Environmental Health DFHEH, Faculty of Veterinary Medicine, University of Helsinki, P, O, Box 66, FI 00014 University of Helsinki, Finland
    BMC Genomics 12:534. 2011
    ..In this study, we performed a detailed comparative genome analysis with H. pylori, providing new insights into non-pylori Helicobacter infections and the mechanisms of transmission between the primary animal host and humans...
  6. pmc A longitudinal study of Campylobacter distribution in a turkey production chain
    Päivikki Perko-Mäkelä
    Finnish Food Safety Authority Evira, Research Department, Production Animal Health, Seinajoki, Finland
    Acta Vet Scand 51:18. 2009
    ..For detection of Campylobacter, a conventional culture method was compared with a PCR method. Campylobacter isolates from different types of samples have been identified to the species level by a multiplex PCR assay...
  7. ncbi request reprint Spontaneous mutation frequency and emergence of ciprofloxacin resistance in Campylobacter jejuni and Campylobacter coli
    Marja Liisa Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    J Antimicrob Chemother 60:1251-7. 2007
    ....
  8. pmc Typing of human Campylobacter jejuni isolates in Finland by pulsed-field gel electrophoresis
    M L Hänninen
    Department of Food and Environment Hygiene, Faculty of Veterinary Medicine, Helsinki University, Finland
    J Clin Microbiol 36:1787-9. 1998
    ..One-third of the isolates had unique PFGE types. In small outbreaks, identical PFGE patterns were demonstrated, indicating a common source of infection...
  9. ncbi request reprint Extension of the species Helicobacter bilis to include the reference strains of Helicobacter sp. flexispira taxa 2, 3 and 8 and Finnish canine and feline flexispira strains
    M L Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, Helsinki University, PO Box 66, FI 00014 Helsinki, Finland
    Int J Syst Evol Microbiol 55:891-8. 2005
    ..bilis. In addition, canine strain F56 differed in all phylogenetic analyses from the H. bilis group and probably represents a novel Helicobacter species...
  10. ncbi request reprint Helicobacter sp. flexispira 16S rDNA taxa 1, 4 and 5 and Finnish porcine Helicobacter isolates are members of the species Helicobacter trogontum (taxon 6)
    Marja Liisa Hänninen
    Faculty of Veterinary Medicine, Department of Food and Environmental Hygiene, PO Box 57, 00014 Helsinki University, Finland
    Int J Syst Evol Microbiol 53:425-33. 2003
    ..trogontum, and that the taxonomy of known flexispiras is less complicated than proposed on the basis of 16S rDNA sequence analysis...
  11. pmc Detection and typing of Campylobacter jejuni and Campylobacter coli and analysis of indicator organisms in three waterborne outbreaks in Finland
    Marja Liisa Hänninen
    Department of Food and Environmental Hygiene, University of Helsinki, PO Box 57, 00014 Helsinki University, Finland
    Appl Environ Microbiol 69:1391-6. 2003
    ..This combination reliably verified similarity or dissimilarity of C. jejuni isolates from patient samples, from drinking water, and from other environmental sources, thus confirming the likely reservoir of an outbreak...
  12. ncbi request reprint Transmission of canine gastric Helicobacter salomonis infection from dam to offspring and between puppies
    M L Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Finland
    Vet Microbiol 62:47-58. 1998
    ..PFGE pattern analysis was shown to be a more distinguishing method than ribotyping to study the similarity of the isolates...
  13. ncbi request reprint Mycoplasma contamination of canine gastric biopsy samples and cultures of gastric Helicobacter spp
    M L Hänninen
    Department of Food and Environmental Science, Faculty of Veterinary Medicine, University of Helsinki, Finland
    FEMS Immunol Med Microbiol 22:335-9. 1998
    ..bizzozeronii on a selective medium containing vancomycin, polymyxin B and trimethoprim used in cultivation of helicobacters. Our data suggest that mycoplasmas occurring on biopsy samples can grow as contaminants on Helicobacter cultures...
  14. pmc Stability of related human and chicken Campylobacter jejuni genotypes after passage through chick intestine studied by pulsed-field gel electrophoresis
    M L Hänninen
    Department of Food and Environmental Hygiene, The Haartman Institute, 00231 Helsinki, Finland
    Appl Environ Microbiol 65:2272-5. 1999
    ..Serotype 27 of strain BTI remained stable. Our study suggests that during intestinal colonization, genomic rearrangement, as demonstrated by changed PFGE and ribopatterns, may occur...
  15. pmc A three-year study of Campylobacter jejuni genotypes in humans with domestically acquired infections and in chicken samples from the Helsinki area
    M L Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki University Central Hospital Diagnostics, 00014 University of Helsinki, Finland
    J Clin Microbiol 38:1998-2000. 2000
    ..The same PFGE genotypes found in humans were also detected in the chicken samples. This suggests that common genotypes were circulating in the area...
  16. pmc Genomic relatedness within five common Finnish Campylobacter jejuni pulsed-field gel electrophoresis genotypes studied by amplified fragment length polymorphism analysis, ribotyping, and serotyping
    M L Hänninen
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, P O Box 57, University of Helsinki, FIN 00014 Helsinki, Finland
    Appl Environ Microbiol 67:1581-6. 2001
    ..These studies using polyphasic genotyping methods suggested that common Finnish C. jejuni genotypes form genetic lineages which colonize both humans and chickens...
  17. ncbi request reprint Campylobacter hyointestinalis subsp. hyointestinalis, a common Campylobacter species in reindeer
    M L Hänninen
    Faculty of Veterinary Medicine, Department of Food and Environmental Hygiene, University of Helsinki, Finland
    J Appl Microbiol 92:717-23. 2002
    ..In addition, to study the genetic diversity of Camp. hyointestinalis subsp. hyointestinalis reindeer isolates by pulsed-field gel electrophoresis (PFGE)...
  18. pmc Swimming and Campylobacter infections
    Daniela Schönberg-Norio
    University of Helsinki, Helsinki, Finland
    Emerg Infect Dis 10:1474-7. 2004
    ..Swimming in natural sources of water was a novel risk factor. Eating undercooked meat and drinking dug-well water were also independent risk factors for Campylobacter infection...
  19. pmc Activities of telithromycin, erythromycin, fluoroquinolones, and doxycycline against Campylobacter strains isolated from Finnish subjects
    Daniela Schönberg-Norio
    Department of Bacteriology and Immunology, Haartman Institute, P O Box 21, FIN 00014 University of Helsinki, Helsinki, Finland
    Antimicrob Agents Chemother 50:1086-8. 2006
    ..Reduced susceptibilities to fluoroquinolones and doxycycline were detected almost exclusively among isolates of foreign origin...
  20. ncbi request reprint Cytolethal distending toxin B gene (cdtB) homologues in taxa 2, 3 and 8 and in six canine isolates of Helicobacter sp. flexispira
    Silja Kostia
    Faculty of Veterinary Medicine, Department of Food and Environmental Hygiene, University of Helsinki, Finland
    J Med Microbiol 52:103-8. 2003
    ..Further, the presence/absence of the cdtB gene in Helicobacter sp. flexispira strains was in accordance with recent taxonomic analysis of the same strains, which suggests that it could serve as a useful marker in Helicobacter taxonomy...
  21. ncbi request reprint Effect of putative efflux pump inhibitors and inducers on the antimicrobial susceptibility of Campylobacter jejuni and Campylobacter coli
    Minna Hannula
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    J Med Microbiol 57:851-5. 2008
    ..Salicylate produced a 2- to 4-fold increase in ciprofloxacin MIC values, whereas little effect was observed in the presence of deoxycholate...
  22. ncbi request reprint Effects of low-level ciprofloxacin challenge in the in vitro development of ciprofloxacin resistance in Campylobacter jejuni
    Minna Hannula
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    Microb Drug Resist 14:197-201. 2008
    ..jejuni population. Persistent ciprofloxacin challenge selects Thr86 --> Ile and/or Asp90 --> Asn mutants...
  23. ncbi request reprint Phylogenetic analysis of Helicobacter species based on partial gyrB gene sequences
    Minna Hannula
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    Int J Syst Evol Microbiol 57:444-9. 2007
    ..A further outcome of this study was achieved by designing gyrB gene-based species-specific PCR primers for the identification of Helicobacter bizzozeronii...
  24. pmc Evaluation of genetic markers and molecular typing methods for prediction of sources of Campylobacter jejuni and C. coli infections
    Rauni Kärenlampi
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, P O Box 66, FI 00014 University of Helsinki, and HUSLAB, Helsinki University Central Hospital Laboratory, Finland
    Appl Environ Microbiol 73:1683-5. 2007
    ..Human isolates showed 5.7 and 61% overlap with cattle and poultry isolates, respectively, by use of PFGE. No unambiguous association was found between marker genes (the Cj1321 and Cj1324 genes) and livestock-associated isolates...
  25. ncbi request reprint PFGE genotyping and antimicrobial susceptibility of Campylobacter in retail poultry meat in Estonia
    Kristi Praakle-Amin
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, P O Box 66, FI 00014 University of Helsinki, Finland
    Int J Food Microbiol 114:105-12. 2007
    ..None of the chicken isolates were resistant to gentamicin, and no turkey isolates to erythromycin or gentamicin...
  26. pmc Longitudinal study of Finnish Campylobacter jejuni and C. coli isolates from humans, using multilocus sequence typing, including comparison with epidemiological data and isolates from poultry and cattle
    Rauni Kärenlampi
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, P O Box 66, FI 00014 University of Helsinki, Finland
    Appl Environ Microbiol 73:148-55. 2007
    ..In contrast, ST-53, ST-58, ST-61, and ST-883 were significantly associated with isolates from cattle. Further studies are needed to reveal the significance of the observed associations...
  27. ncbi request reprint Phylogenetic analysis of gastric and enterohepatic Helicobacter species based on partial HSP60 gene sequences
    Tiina P Mikkonen
    Faculty of Veterinary Medicine, Department of Food and Environmental Hygiene, PO Box 57, 00014 Helsinki University, Finland
    Int J Syst Evol Microbiol 54:753-8. 2004
    ..In addition, a specific PCR method for identifying H. salomonis was developed based on the partial HSP60 sequence...
  28. ncbi request reprint Susceptibility of Campylobacter hyointestinalis subsp. hyointestinalis to antimicrobial agents and characterization of quinolone-resistant strains
    Minna Laatu
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, PO Box 57, FIN 00014 University of Helsinki, Finland
    J Antimicrob Chemother 55:182-7. 2005
    ..To study the susceptibility of Campylobacter hyointestinalis subsp. hyointestinalis to several antimicrobial agents and to investigate the mechanisms of nalidixic acid and ciprofloxacin resistance...
  29. pmc Antimicrobial susceptibilities of Campylobacter strains isolated from Finnish subjects infected domestically or from those infected abroad
    Hilpi Rautelin
    Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Finland
    Antimicrob Agents Chemother 47:102-5. 2003
    ..Of the four different fluoroquinolones studied, ciprofloxacin was the least active (MIC(90), 64 micro g/ml)...
  30. ncbi request reprint Prevalence and genetic characterization of Listeria monocytogenes in retail broiler meat in Estonia
    Kristi Praakle-Amin
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Finland
    J Food Prot 69:436-40. 2006
    ..Seventy-one L. monocytogenes isolates, including all PFGE types, were serotyped, and three serotypes (1/2a, 1/2b, and 4b) were obtained. Serotype 1/2a accounted for 96% of the isolates...
  31. ncbi request reprint Evaluation of the lactose Tergitol-7, m-Endo LES, Colilert 18, Readycult Coliforms 100, Water-Check-100, 3M Petrifilm EC and DryCult Coliform test methods for detection of total coliforms and Escherichia coli in water samples
    Ari Hörman
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Post Box 66, FIN 00014, Helsinki, Finland
    Water Res 40:3249-56. 2006
    ..coli than the LTTC method. In general, those tests based on the analysis of a 1-ml sample (Petrifilm EC and DryCult Coli) showed weak sensitivity (39.5-52.5%) but high specificity (90.9-78.8%)...
  32. pmc Domestically acquired Campylobacter infections in Finland
    Antti Vierikko
    University of Helsinki Haartman Institute, Department of Bacteriology and Immunology, Helsinki, Finland
    Emerg Infect Dis 10:127-30. 2004
    ..The highest rate was observed among those 70-74 years of age. Domestic C. jejuni isolates were especially frequent in the eastern districts. Six serotypes covered 61% of all C. jejuni isolates...
  33. ncbi request reprint Monitoring of Cryptosporidium and Giardia in the Vantaa river basin, southern Finland
    Marja Liisa Hänninen
    Department of Food and Environmental Hygiene, University of Helsinki, P O Box 57, FIN 00014, Finland
    Int J Hyg Environ Health 208:163-71. 2005
    ..In general, both methods to appropriate to detect (oo)cysts, but grab samples yielded more positive results. Grab sampling is also more practical and less expensive than analysis of A. piscinalis...
  34. pmc Campylobacter spp., Giardia spp., Cryptosporidium spp., noroviruses, and indicator organisms in surface water in southwestern Finland, 2000-2001
    Ari Hörman
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    Appl Environ Microbiol 70:87-95. 2004
    ..There were no significant correlations between counts or count levels for thermotolerant coliforms or E. coli or the presence of F-RNA phages and pathogens in the samples analyzed...
  35. ncbi request reprint Meta-analysis in assessment of the prevalence and annual incidence of Giardia spp. and Cryptosporidium spp. infections in humans in the Nordic countries
    Ari Hörman
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
    Int J Parasitol 34:1337-46. 2004
    ....
  36. pmc Elimination of botulinum neurotoxin (BoNT) type B from drinking water by small-scale (personal-use) water purification devices and detection of BoNT in water samples
    Ari Hörman
    Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Finland
    Appl Environ Microbiol 71:1941-5. 2005
    ..3 log10 units). The rapid EIAs intended for the detection of BoNT from various types of samples failed to detect BoNT from aqueous samples containing an estimated concentration of BoNT of 396,000 ng/liter...