scholarly journals Tetracycline Resistance Genes in Escherichia coli Strains Isolated From Biofilm of Drinking Water System in Poultry Farms

2022 ◽  
Author(s):  
Majid Gholami AHANGARAN ◽  
◽  
Paniz ZINSAZ ◽  
Oveys POURMAHDI ◽  
Asiye AHMADI-DASTGERDI ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Drinking Water ◽  
Resistance Genes ◽  
Water System ◽  
Tetracycline Resistance ◽  
Tetracycline Resistance Genes ◽  
Drinking Water System ◽  
Poultry Farms

scholarly journals Impact of unhygienic conditions during slaughtering and processing on spread of antibiotic resistant Escherichia coli from poultry

2017 ◽  
Vol 8 (2) ◽  
Author(s):  
Mamoona Amir ◽  
Muhammad Riaz ◽  
Yung-Fu Chang ◽  
Saeed Akhtar ◽  
Sang Ho Yoo ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Drinking Water ◽  
Resistance Genes ◽  
Tap Water ◽  
Tetracycline Resistance ◽  
Health Concern ◽  
Cross Contamination ◽  
Broiler Meat ◽  
E Coli ◽  
Tetracycline Resistance Genes

Antibiotic resistance in Escherichia coli is a global health concern. We studied all possible routes of cross contamination of broiler meat with resistant E. coli from broiler feces at poultry shops. Various sample categories namely poultry feces, meat (n=225 for each), slaughterer hands, consumer hands, slaughterer knife, canister, tap water, carcass, feed and drinking water (n=50 for each) were collected from local poultry processing market. Samples were screened for prevalence of E. coli, resistance of isolates against ten antibiotics and presence of tetracycline- resistance genes in the isolates. Fecal samples had greatest colony count (4.1×104 CFU/g) as compared to meat (1.9×104 CFU/g) samples. Samples of consumer hands (6%) and tap water (12%) had less prevalence percentages of E. coli as compared to slaughterer hands (92%) and drinking water of broiler (86%). Isolates of eight sample categories had high resistant rate (≥90%) against oxytetracycline. On average, about 94% of the isolates from various sample categories possessed multidrug-resistance (MDR). Tetracycline-resistance genes (tetA and tetB) were identified in all sample categories except isolates of consumer hands and tap water. The distribution of tetracycline-resistance genes was significantly greater in fecal isolates (42%) than meat isolates (25%). The study depicted the spread of resistant E. coli in broiler meat through all studied routes of contamination of slaughtering periphery. This problem can be mitigated by strict monitoring of antibiotics use at poultry farms, prevention of cross contamination by adopting hygienic slaughter and vigorously screening the market meat for resistant E. coli.

scholarly journals Prevalence of Antimicrobial Resistance and Transfer of Tetracycline Resistance Genes in Escherichia coli Isolates from Beef Cattle

2015 ◽  
Vol 81 (16) ◽  
pp. 5560-5566 ◽  
Author(s):  
Seung Won Shin ◽  
Min Kyoung Shin ◽  
Myunghwan Jung ◽  
Kuastros Mekonnen Belaynehe ◽  
Han Sang Yoo
Keyword(s):  
Escherichia Coli ◽  
South Korea ◽  
Beef Cattle ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Tetracycline Resistance ◽  
Tetracycline Resistance Gene ◽  
Content Type ◽  
E Coli ◽  
Tetracycline Resistance Genes

ABSTRACTThe aim of this study was to investigate the prevalence and transferability of resistance in tetracycline-resistantEscherichia coliisolates recovered from beef cattle in South Korea. A total of 155E. coliisolates were collected from feces in South Korea, and 146 were confirmed to be resistant to tetracycline. The tetracycline resistance genetet(A) (46.5%) was the most prevalent, followed bytet(B) (45.1%) andtet(C) (5.8%). Strains carryingtet(A) plustet(B) andtet(B) plustet(C) were detected in two isolates each. In terms of phylogenetic grouping, 101 (65.2%) isolates were classified as phylogenetic group B1, followed in decreasing order by D (17.4%), A (14.2%), and B2 (3.2%). Ninety-one (62.3%) isolates were determined to be multidrug resistant by the disk diffusion method. MIC testing using the principal tetracyclines, namely, tetracycline, chlortetracycline, oxytetracycline, doxycycline, and minocycline, revealed that isolates carryingtet(B) had higher MIC values than isolates carryingtet(A). Conjugation assays showed that 121 (82.9%) isolates could transfer a tetracycline resistance gene to a recipient via the IncFIB replicon (65.1%). This study suggests that the high prevalence of tetracycline-resistantE. coliisolates in beef cattle is due to the transferability of tetracycline resistance genes betweenE. colipopulations which have survived the selective pressure caused by the use of antimicrobial agents.

Prevalence of tetracycline resistance genes and identification of tet(M) in clinical isolates of Escherichia coli from sick ducks in China

2013 ◽  
Vol 62 (6) ◽  
pp. 851-858 ◽  
Author(s):  
Gong-Zheng Hu ◽  
Yu-Shan Pan ◽  
Hua Wu ◽  
Han Hu ◽  
Rui Xu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Resistance Genes ◽  
Promoter Region ◽  
Tetracycline Resistance ◽  
Resistance Rate ◽  
Clinical Isolates ◽  
Animal Origin ◽  
Broth Microdilution ◽  
M Gene ◽  
Tetracycline Resistance Genes

Tetracycline resistance is one of the most frequently encountered resistance properties in bacteria of animal origin. The aim of the present study was to investigate the prevalence and diversity of tetracycline resistance (tet) genes among Escherichia coli clinical isolates from diseased ducks in China and to report the identification and sequencing of the tet(M) gene. The susceptibility of 85 Escherichia coli strains to tetracyclines was determined by broth microdilution, and the presence of tet genes was investigated by multiplex PCR. All of the 85 isolates were fully resistant to both oxytetracycline and tetracycline, and 76.5 % were resistant to doxycycline. Seventy-seven of the isolates (90.6 %) encoded multiple tet genes, with 17.6, 38.8 and 34.1 % encoding two, three and four tet genes, respectively, and only 7.1 % encoded a single tet(A) gene. The MICs of oxytetracycline and tetracycline for all isolates ranged from 16 to ≥128 µg ml−1 with a MIC90 of >128 µg ml−1, regardless of the type or number of tet genes encoded. Isolates containing tet(M) commonly had more than one tet gene per strain. The doxycycline resistance rate in the tet(M)-positive isolates was significantly higher than in the tet(M)-negative isolates (P<0.05). A full-length tet(M) gene, including the promoter region, was obtained by PCR in seven of the 41 tet(M)-positive isolates and was sequenced and cloned. The cloned tet(M) gene conferred resistance to tetracyclines in the recombinant Escherichia coli host strain. These results revealed that, in these isolates, the prevalence of multiple tet genes was strikingly high and that tet(M) played a role in doxycycline resistance.

scholarly journals Research progress on the injury mechanism and detection method of disinfectant-injured Escherichia coli in the drinking water system

2021 ◽  
Author(s):  
Cui-min Feng ◽  
Na Zhu ◽  
Ji-yue Jin ◽  
Ying Li ◽  
Zhen Xu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Drinking Water ◽  
Water System ◽  
Damage Mechanism ◽  
Water Disinfection ◽  
Detection Methods ◽  
Research Progress ◽  
Future Research ◽  
Drinking Water System ◽  
Sublethal Injury

Abstract Sublethally injured bacteria can still develop into normal bacteria under favorable growth conditions, and their pathogenicity poses a great threat to human health. In the drinking water system, some bacteria cause sublethal injury under the action of disinfectants, that is, disinfectant-injured bacteria. Hence, the detection of disinfectant-injured bacteria and the elucidation of injury mechanisms are of great significance for ensuring the microbial safety of drinking water systems. This article takes the indicator bacteria Escherichia coli as the research object, reviews and summarizes the sublethal injury conditions, damage mechanism, and detection methods of disinfectant-injured bacteria in drinking water, and puts forward a prospect for the future research directions of drinking water disinfection and disinfectant-injured bacteria.

scholarly journals Frequency and Distribution of Tetracycline Resistance Genes in Genetically Diverse, Nonselected, and Nonclinical Escherichia coli Strains Isolated from Diverse Human and Animal Sources

2004 ◽  
Vol 70 (4) ◽  
pp. 2503-2507 ◽  
Author(s):  
Andrew Bryan ◽  
Nir Shapir ◽  
Michael J. Sadowsky
Keyword(s):  
Escherichia Coli ◽  
Resistance Genes ◽  
Natural Populations ◽  
Tetracycline Resistance ◽  
First Report ◽  
E Coli ◽  
Tetracycline Resistance Genes ◽  
Resistance Determinants

ABSTRACT Nonselected and natural populations of Escherichia coli from 12 animal sources and humans were examined for the presence and types of 14 tetracycline resistance determinants. Of 1,263 unique E. coli isolates from humans, pigs, chickens, turkeys, sheep, cows, goats, cats, dogs, horses, geese, ducks, and deer, 31% were highly resistant to tetracycline. More than 78, 47, and 41% of the E. coli isolates from pigs, chickens, and turkeys were resistant or highly resistant to tetracycline, respectively. Tetracycline MICs for 61, 29, and 29% of E. coli isolates from pig, chickens, and turkeys, respectively, were ≥233 μg/ml. Muliplex PCR analyses indicated that 97% of these strains contained at least 1 of 14 tetracycline resistance genes [tetA, tetB, tetC, tetD, tetE, tetG, tetK, tetL, tetM, tetO, tetS, tetA(P), tetQ, and tetX] examined. While the most common genes found in these isolates were tetB (63%) and tetA (35%), tetC, tetD, and tetM were also found. E. coli isolates from pigs and chickens were the only strains to have tetM. To our knowledge, this represents the first report of tetM in E. coli.

Sign in / Sign up

Export Citation Format

Share Document