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. 2014 Sep;7(9):e12129.
doi: 10.5812/jjm.12129. Epub 2014 Sep 1.

Tetracycline Resistance Genes in Campylobacter jejuni and C. coli Isolated From Poultry Carcasses

Bahman Abdi-Hachesoo  1 , Rahem Khoshbakht  2 , Hassan Sharifiyazdi  3 , Mohammad Tabatabaei  4 , Saeid Hosseinzadeh  5 , Keramat Asasi  1
Affiliations

Tetracycline Resistance Genes in Campylobacter jejuni and C. coli Isolated From Poultry Carcasses

Bahman Abdi-Hachesoo et al. Jundishapur J Microbiol. 2014 Sep.

Abstract

Background: Campylobacter is one of the leading bacterial species causing foodborne illnesses in humans. Antimicrobial agents have been extensively used for treatment of Campylobacter infections; but in the recent years, both animal and human isolates of this bacterium have shown resistance to several antibiotics such as tetracycline.

Objectives: The aim of this study was to investigate the presence of genetic determinants of tetracycline resistance in Campylobacter spp. recovered from poultry carcasses in Shiraz, Iran.

Materials and methods: Eighty-three thermophilic Campylobacter spp. Isolates were first identified based on multiplex polymerase chain reaction (PCR) and then screened for presence of tetracycline resistance genes (tet (A), tet (B), tet (O) and te (S)) by PCR.

Results: The overall prevalence of Campylobacter jejuni and C. coli among the examined isolates was 51.8% and 48.2%, respectively. Tetracycline resistance genes of tet (B) and tet (S) were not seen among these Campylobacter spp. Isolates, whereas the most common tet gene identified was tet (O), found in 83.1% (69/83) of all the isolates. The tet (O) gene sequence comparison between C. jejuni and C. coli showed 100% similarity and these sequences (JX853721and JX853722) were also identical to the homologous sequences of other strains of Campylobacter spp. existing in the GenBank databases. In addition, tet (A) was found in 18% (15/83) of Campylobacter spp. isolates. To our knowledge, this represents the first report of tet (A) in Campylobacter spp. There was 100% homology between the sequences of tet (A) from this study (JX891463 and JX891464) and the tet (A) sequences mentioned for other bacteria in the GenBank databases.

Conclusions: The high prevalence of tet (O) resistance gene along with new detection of tet (A) resistance gene in Campylobacter spp. isolated from poultry carcasses revealed an extensive tetracycline resistance among Campylobacter isolates from poultry in Iran. It emphasized the need for cautious use of tetracycline in poultry production to decrease the extension of tetracycline-resistant Campylobacter spp.

Keywords: Campylobacter; Tetracycline Resistance.

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Figures

Figure 1.
Figure 1.. Polymerase Chain Reaction Amplification of the tet (O) Gene
M, 100bp DNA ladder (Vivantis, Malaysia); L1, negative control (distilled water); L2, tet (O) positive control (JX853721); L3, L4, L7, L8 and L9, tet (O) positive samples; L5, L6 and L10, tet (O) negative samples.
Figure 2.
Figure 2.. Polymerase Chain Reaction Amplification of the tet (A) Gene
M, 100bp DNA ladder (Vivantis, Malaysia); L1: tet (A) positive control (JX891463); L2, tet (A) negative control (distilled water); L3-L9, tet (A) positive samples.
See this image and copyright information in PMC

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