Isolation and in vitro antimicrobial susceptibility of porcine Lawsonia intracellularis from Brazil and Thailand

Suphot Wattanaphansak, Carlos Eduardo Real Pereira, Wenika Kaenson, Pornchalit Assavacheep, Rachod Tantilertcharoen, Talita Pilar Resende, Javier Alberto Barrera-Zarate, Juliana Saes Vilaça De Oliveira-Lee, Ulrich Klein, Connie Jane Gebhart, Roberto Maurício Carvalho Guedes

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Background: Lawsonia intracellularis is an obligate intracellular bacterium which cannot be cultured by conventional bacteriological methods. Furthermore, L. intracellularis needs enriched medium and a unique atmosphere for isolation, cultivation and propagation. Because of this,there are only a few isolates of L. intracellularis available and few studies in vitro demonstrating the susceptibility of this bacterium to antimicrobial agents. The objectives of this study were to isolate South American and Southeast Asia strains of L.intracellularis and to determine the in vitro antimicrobial activity against these isolates. Tested antimicrobials included: chlortetracycline, lincomycin, tiamulin, tylosin and valnemulin(against both Brazilian and Thailand strains) and additionally, amoxicillin, zinc-bacitracin, carbadox, enrofloxacin, gentamicin, sulfamethazine, trimethoprim, spectinomycin and a combination (1:1) of spectinomycin and lincomycin were also tested against the Thai isolates. The minimum inhibitory concentration (MIC) was determined by the antimicrobial activity that inhibited 99% of L. intracellularis growth in a cell culture as compared to the control (antimicrobial-free). Results: Two strains from Brazil and three strains from Thailand were successfully isolated and established in cell culture. Each antimicrobial was evaluated for intracellular and extracellular activity. Pleuromutilin group (valnemulin and tiamulin) and carbadox were the most active against L. intracellularis strains tested. Tylosin showed intermediate activity, chlortetracycline had variable results between low and intermediate activity, as well as spectinomycin, spectinomycin and lincomycin, amoxicillin, sulfamethazine and enrofloxacin. L. intracellularis was resistant to lincomycin, gentamicin, trimethoprim, colistin and bacitracin in in vitro conditions. Conclusions: This is the first report of isolation of L. intracellularis strains from South America and Southeast Asia and characterization of the antimicrobial susceptibility patterns of these new strains.

Original languageEnglish (US)
Article number27
JournalBMC microbiology
Issue number1
StatePublished - Jan 31 2019


  • Antimicrobial susceptibility
  • Ileitis
  • Lawsonia intracellularis
  • MIC
  • Pigs
  • Proliferative enteropathy

PubMed: MeSH publication types

  • Journal Article
  • Research Support, Non-U.S. Gov't

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    Wattanaphansak, S., Pereira, C. E. R., Kaenson, W., Assavacheep, P., Tantilertcharoen, R., Resende, T. P., Barrera-Zarate, J. A., De Oliveira-Lee, J. S. V., Klein, U., Gebhart, C. J., & Guedes, R. M. C. (2019). Isolation and in vitro antimicrobial susceptibility of porcine Lawsonia intracellularis from Brazil and Thailand. BMC microbiology, 19(1), [27].