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A few reports are available for detection of L. monocytogenes in fish in Iraq, however, the current study was undertaken to investigate the potential role of Listeria spp. in common carp fish in Baghdad province, Iraq. A total of fresh thirty raw common carp (Cyprinus carpio) were purchased from fish sellers of various local markets in Baghdad city from (December 2017 to March 2018) The viscera was removed aseptically, the bacterial isolation and identification was conducted by a conventional culture method using Listeria selective media, biochemical tests and Vitek 2 for gram-positive. Pathogenicity of isolates was studied in vivo by inoculating mice with bacterium. Targeting virulence associated genes was used to detect the virulence and to confirm the L. monocytogenes isolates. The isolates were tested for antimicrobial susceptibility by disk diffusion method for 12 antibiotics. The results revealed that 6.66% of L. monocytogenes were identified from common carp fish viscera and the isolates were pathogenic in mice. L. monocytogenes virulence associated genes were detected in both isolates, while L. innocua virulence associated gene (Lin0372) was detected in one of the two isolates. The isolates were resistant to 7 out of 12 antibacterial drugs including tetracycline, ampicillin, methicillin, cefixime, oxacillin, cefotaxime and penicillin G. The results suggest that presence of L. monocytogenes in fish may have a serious role in public health hygienic in humans.

Detection and pathogenicity of Listeria monocytogenes in common carp (Cyprinus carpio) fish in Baghdad, Iraq