Comparative Analysis of Chloramphenicol-Resistant Isolated from Dairy Companies in Korea.

Although chloramphenicol is currently banned from use in livestock, other phenicols, such as florfenicol and thiamphenicol, have been used for the treatment of bacterial infections in domestic cattle in Korea. This study compares the characteristics of chloramphenicol-resistant isolated from the bulk tank milk of four major dairy companies in Korea. Although the distribution of multidrug resistance patterns showed no significant differences between the four companies, 85 chloramphenicol-resistant isolates showed a significantly high number of resistances against five or six antimicrobial classes (37.

Detection of Linezolid-Resistant and Isolates from the Layer Operation System in Korea.

Linezolid (LNZ) is one of the most important antimicrobial agents against infections caused by gram-positive bacteria, including enterococci. In a layer operation system, antimicrobial resistance can be transferred to commercial layers via the fecal-oral route. This study investigated the presence and distribution of LNZ-resistant and in a layer operation system.

Virulence Variation of Gallinarum Isolates through SpvB by CRISPR Sequence Subtyping, 2014 to 2018.

Gallinarum is a Gram-negative bacteria that causes fowl typhoid, a septicemic disease with high morbidity and mortality that affects all ages of chickens. Although vaccines and antimicrobials have been used nationwide to eradicate the disease, the malady is still prevalent in Korea. In this study, we investigated the virulence and genetic variation of 116 .

Molecular characteristics of optrA-carrying Enterococcus faecalis from chicken meat in South Korea.

The purpose of this study was to identify the genetic environment of optrA gene in linezolid (LZD)-resistant Enterococcus faecalis from chicken meat and to describe the probable mechanism of dissemination of the optrA gene through plasmid or chromosomal integration. Whole genome sequencing and analysis revealed that all 3 E. faecalis isolates confirmed as LZD- and chloramphenicol-resistant carried fexA adjacent to the optrA gene as well as a variety of resistance genes for macrolides, tetracyclines, and aminoglycosides, simultaneously.

Characteristics of linezolid-resistant Enterococcus faecalis isolates from broiler breeder farms.

Linezolid is an oxazolidinone class antibiotic used for treatment infections caused by various multidrug-resistant gram-positive pathogens including enterococci. However, recently, linezolid-resistant isolates in animals are considered as a human health hazard. In a broiler operation system, antimicrobial resistance can be transferred to the environment and commercial broiler via the fecal-oral route.

Molecular characteristics of fluoroquinolone-resistant avian pathogenic Escherichia coli isolated from broiler chickens.

Avian pathogenic Escherichia coli (APEC) is a major pathogen in the poultry industry worldwide including Korea. In this study, the phenotypic and genotypic characteristics of 33 fluoroquinolone (FQ)-resistant APEC isolates from broilers were analyzed. All FQ-resistant APEC isolates showed amino acid exchanges at both gyrA and parC and high minimal inhibitory concentrations for FQs.

Antimicrobial resistance monitoring of commensal Enterococcus faecalis in broiler breeders.

Enterococcus faecalis (E. faecalis) has rapidly acquired resistance to multiple antimicrobials, and the antimicrobial resistance of E. faecalis from broiler breeders has been implicated in its vertical transmission to their offspring.

Impacts and characteristics of antimicrobial resistance of Escherichia coli isolates by administration of third-generation cephalosporins in layer hatcheries.

We investigated the characteristics and persistence of Escherichia coli resistant to third-generation cephalosporins (3GCs) by early administration of ceftiofur or gentamicin and to analyze the impact of 3GC use in hatcheries. We studied 10 ceftiofur-treated flocks (CTFs) and 10 gentamicin-treated flocks (GTFs) of layers. Fecal samples were collected at 1, 2, 4, 8, 18, and 30 weeks of age for all flocks.

Molecular characterization of avian pathogenic Escherichia coli from broiler chickens with colibacillosis.

Avian pathogenic Escherichia coli (APEC) causes extensive mortality in poultry flocks, leading to extensive economic losses. The aim of this study was to investigate the phenotypic and genotypic characteristics and antimicrobial resistance of recent APEC isolates. Of the 79 APEC isolates, the most predominant serogroup was O78 (16 isolates, 20.

Antimicrobial Resistance and Genetic Diversity of Serotypes Recovered from Edible Pork Offal from Korea.

Although edible offal can be easily contaminated with foodborne bacteria and regarded as important transfers of antimicrobial resistance to humans, the characterization of bacteria from edible offal have not been researched sufficiently. This study is the first to focus on the molecular characterization of isolated from edible pork offal. From a total of 52 isolates from edible pork offal, 44 (80.

Genetic characterization of high-level aminoglycoside-resistant Enterococcus faecalis and Enterococcus faecium isolated from retail chicken meat.

Retail chicken meat can play a role in the transfer of drug resistance to humans through the handling or ingestion of improperly cooked meat contaminated with resistant enterococci. In fact, high-level aminoglycoside-resistance (HLAR) in enterococci identified in human cases. Therefore, the prevalence and genetic characterization of HLAR in enterococci in retail chicken meat were investigated in this study.

Molecular Characterization of Multidrug-Resistant Isolates from Edible Offal in Korea.

Edible offal is significantly contaminated by antimicrobial-resistant . from edible offal is harboring various antimicrobial resistance and virulence genes. Improvements in hygienic conditions of edible offal production is required.

Molecular characterization of antimicrobial-resistant Enterococcus faecalis and Enterococcus faecium isolated from layer parent stock.

Enterococcus faecalis (E. faecalis) and Enterococcus faecium (E. faecium) are ubiquitous intestinal bacteria in humans and animals that can easily acquire antimicrobial resistance, which allows them to have roles as antimicrobial resistance indicators.

Characteristics of third-generation cephalosporin-resistant Salmonella from retail chicken meat produced by integrated broiler operations.

Integrated broiler operations, which control and operate vertically through all phases of the chicken industry, have applied biosecurity and sanitation practices, housing technologies, feeding regimens, and antibiotic applications in different ways to improve food safety. The objective of this study was to compare the prevalence and antimicrobial resistance profiles of Salmonella isolates recovered from 6 different integrated broiler operations and to analyze the characteristics of extended-spectrum β-lactamase (ESBL)- and plasmid-mediated AmpC β-lactamase (pAmpC)-producing Salmonella isolates. Among 336 chicken meat samples, 57 were observed to be positive for Salmonella.

Molecular characterization of erythromycin and tetracycline-resistant Enterococcus faecalis isolated from retail chicken meats.

Enterococcus faecalis is a ubiquitous intestinal bacterium in human and animals that can easily acquire antimicrobial resistance, which allows it to play the role of an antimicrobial resistance indicator. The objectives of this study were to characterize erythromycin and tetracycline-resistant E. faecalis isolated from retail chicken meats.

Characteristics of cephalosporin-resistant Salmonella isolates from poultry in Korea, 2010-2017.

Cephalosporins are the key drugs for the treatment of salmonellosis. Resistance to cephalosporins in Salmonella spp. has become a serious public health concern worldwide.

Molecular characteristics of extended-spectrum and plasmid-mediated AmpC β-lactamase-producing Escherichia coli isolated from commercial layer in Korea.

In the poultry industry, commercial layer farms play an important role in meeting the protein demand through the supply of eggs. However, the risk of contamination by β-lactamase-producing Escherichia coli in eggs laid by commercial chickens is significant. In this study, we investigated the rate of extended-spectrum β-lactamase (ESBL) and plasmid-mediated AmpC (pAmpC) β-lactamase-producing E.

Characteristics of High-Level Ciprofloxacin-Resistant Enterococcus faecalis and Enterococcus faecium from Retail Chicken Meat in Korea.

Genes encoding ciprofloxacin resistance in enterococci in animals may be transferred to bacteria in the animal gut and to zoonotic bacteria where they could pose a human health hazard. The objective of this study was to characterize antimicrobial resistance in high-level ciprofloxacin-resistant (HLCR) Enterococcus faecalis and Enterococcus faecium isolated from retail chicken meat. A total of 345 enterococci (335 E.

Comparative genetic characterization of third-generation cephalosporin-resistant Escherichia coli from chicken meat produced by integrated broiler operations in South Korea.

Vertical integration of the broiler industry allows producers to combine different biosecurity and sanitation practices, housing technologies, and feeding regimens to improve food safety. The objectives of this study were to determine the antimicrobial resistance pattern of β-lactamase-producing E. coli and to compare the characteristics of E.

Prevalence and characterization of in two integrated broiler operations in Korea.

Background: Vertical integration of the broiler industry allows producers to combine different biosecurity and sanitation practices, housing technologies, and feeding regimens to improve food safety. The purpose of this study was to investigate the prevalence and distribution of to determine the source of contaminants, and to reveal the relationships between isolates at each step in the vertically integrated broiler production system in two representative integrated broiler companies in Korea.

Results: A total of 2148 samples were collected from 2 broiler breeder hatcheries, 14 broiler breeder farms, 3 broiler hatcheries, 16 broiler farms, 8 broiler transporting trucks and 6 slaughterhouses belonging to representative integrated broiler companies, and 205 (9.