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Abstract
Forty-five strains of lactic acid bacteria were isolated from poultry feces sampled
from an industrial farm located in the Nantes area (France), and most of them belong
to the Streptococcus or Lactobacillus genus according to the results obtained by Galerie
API and molecular methods. The most representative lactic acid bacteria strains were
screened for antibacterial compound production against 2 indicator organisms (Listeria
innocua F and Campylobacter jejuni 11168) by means of the agar diffusion test. Strain
S37, identified as Enterococcus faecalis, exhibited a clear anti-listerial activity
and a slight anti-Campylobacter activity, whereas strain S42, identified as Lactobacillus
reuteri, exhibited only anti-Campylobacter activity. Regarding the results of proteolytic,
heat, and neutralizing treatments of supernatants from the aforementioned strains,
we can conclude that antagonism observed is attributed to antimicrobial peptide or
bacteriocin in the case of strain S37, whereas it is ascribable to a nonbacteriocin,
likely a reuterin, in the case of strain S42.