<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec id="j_jvetres-2022-0015_s_005">
<h3>Introduction</h3>
<p>Domestic poultry is a natural reservoir of <italic>Campylobacter</italic>, the host–pathogen interaction being predominantly asymptomatic. This study investigated whether chickens remain asymptomatic partly because of lactic acid bacteria (LAB).</p>
</sec>
<sec id="j_jvetres-2022-0015_s_006">
<h3>Material and Methods</h3>
<p><italic>Campylobacter</italic> spp. and LAB were isolated from the gut of poultry chickens using enrichment and screening assays and were identified <italic>via</italic> rDNA sequencing. The <italic>C. jejuni</italic> DC3 isolate was grown in different cell-free supernatants (CFS) generated from a priority LAB isolate. An <italic>in vivo</italic> challenge involving the <italic>C. jejuni</italic> and LAB isolates using a chicken model was performed to confirm the <italic>in vitro</italic> findings.</p></sec>
<sec id="j_jvetres-2022-0015_s_007">
<h3>Results</h3>
<p>Twelve presumptive LAB isolates had anti-<italic>C. jejuni</italic> activity based on cross-streak and agar plug assays, with <italic>Lactobacillus sakei</italic> L14 isolate exhibiting the highest activity. Inhibition by <italic>L. sakei</italic> L14 CFS of the growth of <italic>C. jejuni</italic> occurred in a dose-dependent manner. <italic>Campylobacter jejuni</italic> DC3 inhibition was most evident in CFS harvested at 72 h and produced by co-culture with the pathogen. Neutralisation of the CFS abrogated the observed inhibition. Co-infection with <italic>C. jejuni</italic> DC3 and <italic>L. sakei</italic> L14 <italic>in vivo</italic>, however, failed to inhibit <italic>C. jejuni</italic> colonisation in chickens.</p></sec>
<sec id="j_jvetres-2022-0015_s_008">
<h3>Conclusion</h3>
<p>The results suggest that the anti-<italic>C. jejuni</italic> effect of <italic>L. sakei</italic> L14 in chickens may be due to mechanisms other than direct inhibition of growth.</p>
</sec>
</abstract>

Introduction
Domestic poultry is a natural reservoir of Campylobacter, the host–pathogen interaction being predominantly asymptomatic. This study investigated whether chickens remain asymptomatic partly because of lactic acid bacteria (LAB).


Material and Methods
Campylobacter spp. and LAB were isolated from the gut of poultry chickens using enrichment and screening assays and were identified via rDNA sequencing. The C. jejuni DC3 isolate was grown in different cell-free supernatants (CFS) generated from a priority LAB isolate. An in vivo challenge involving the C. jejuni and LAB isolates using a chicken model was performed to confirm the in vitro findings.

Results
Twelve presumptive LAB isolates had anti-C. jejuni activity based on cross-streak and agar plug assays, with Lactobacillus sakei L14 isolate exhibiting the highest activity. Inhibition by L. sakei L14 CFS of the growth of C. jejuni occurred in a dose-dependent manner. Campylobacter jejuni DC3 inhibition was most evident in CFS harvested at 72 h and produced by co-culture with the pathogen. Neutralisation of the CFS abrogated the observed inhibition. Co-infection with C. jejuni DC3 and L. sakei L14 in vivo, however, failed to inhibit C. jejuni colonisation in chickens.

Conclusion
The results suggest that the anti-C. jejuni effect of L. sakei L14 in chickens may be due to mechanisms other than direct inhibition of growth.

<italic>In vitro</italic> and <italic>in vivo</italic> activity of <italic>Lactobacillus sakei</italic> L14 strain against <italic>Campylobacter jejuni</italic> DC3 strain

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

 and  activity of  L14 strain against  DC3 strain

Introduction
Domestic poultry is a natural reservoir of Campylobacter, the host–pathogen interaction being predominantly asymptomatic. This study investigated...

In vitro and in vivo activity of Lactobacillus sakei L14 strain against Campylobacter jejuni DC3 strain

Published Online: Mar 25, 2022

Page range: 85 - 94

Received: Sep 12, 2021

Accepted: Mar 06, 2022

DOI: https://doi.org/10.2478/jvetres-2022-0015

Keywords
lactic acid bacteria, chickens, growth inhibition

© 2022 J.R.P. Catacutan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

In vitro and in vivo activity of Lactobacillus sakei L14 strain against Campylobacter jejuni DC3 strain

Published Online: Mar 25, 2022

Page range: 85 - 94

Received: Sep 12, 2021

Accepted: Mar 06, 2022

DOI: https://doi.org/10.2478/jvetres-2022-0015

Keywordslactic acid bacteria, chickens, growth inhibition

© 2022 J.R.P. Catacutan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
lactic acid bacteria, chickens, growth inhibition