A5048161793- Viral gastroenteritis research and epidemiology
- Salmonella and Campylobacter epidemiology
- Animal Disease Management and Epidemiology
- Influenza Virus Research Studies
- Animal Virus Infections Studies
- Microbial infections and disease research
- Herpesvirus Infections and Treatments
- Viral Infections and Vectors
- Escherichia coli research studies
- Biosensors and Analytical Detection
- Plant Virus Research Studies
- Antibiotic Resistance in Bacteria
- Aquaculture disease management and microbiota
- Bacteriophages and microbial interactions
- Viral Infections and Immunology Research
- Virus-based gene therapy research
- Gold and Silver Nanoparticles Synthesis and Applications
- Bird parasitology and diseases
- Respiratory viral infections research
- Streptococcal Infections and Treatments
- Bacterial Identification and Susceptibility Testing
- Animal Nutrition and Physiology
- Virology and Viral Diseases
- Vibrio bacteria research studies
- Listeria monocytogenes in Food Safety
Animal and Plant Quarantine Agency
2015-2024
Ministry of Agriculture, Food and Rural Affairs
2007-2023
U.S. National Poultry Research Center
2017
Georgia Department of Agriculture
2017
Centers for Disease Control and Prevention
2017
Anyang Institute of Technology
2014
Government of the Republic of Korea
2014
United States Department of State
2013
United States Department of Agriculture
2008-2013
Agricultural Research Service
2013
An unprecedented outbreak of H5N1 highly pathogenic avian influenza (HPAI) has been reported for poultry in eight different Asian countries, including South Korea, since December 2003. A phylogenetic analysis the viral genes showed that isolates from Korea were origin and contained hemagglutinin neuraminidase A/goose/Guangdong/1/96 (Gs/Gd) lineage. The current strains Asia, Korean isolates, share a gene constellation similar to Penfold Park, Hong Kong, late 2002 contain some molecular...
Duck hepatitis virus type 1 (DHV-1) was previously classified as an enterovirus, based primarily on observed morphology and physicochemical properties of the virion. The complete nucleotide sequences two strains (DRL-62 R85952) DHV-1 have been determined. Excluding poly(A) tail, genomes are 7691 7690 nt, respectively, contain a single, large open reading frame encoding polyprotein 2249 aa. genome is organized those members family Picornaviridae : 5′ untranslated region...
Salmonellosis is one of the most prevalent foodborne illnesses. The outbreak this disease often associated with eggs. In study, prevalence and characteristics Salmonella was surveyed in layer farms Korea. addition, risk factors affecting these were also assessed. Of 32 67 flocks examined, 19 (59.3%) 34 (50.7%) observed to be positive for contamination. detected surrounding environment such as feces (41.8%), dust (40.3%), egg shells (17.2%), well internal contents (5.2%). incidence positives...
Exposure to infected poultry is a suspected cause of avian influenza (H5N1) virus infections in humans. We detected infectious droplets and aerosols during laboratory-simulated processing asymptomatic chickens with human- (clades 1 2.2.1) avian- 1.1, 2.2, 2.1) origin H5N1 viruses. fewer airborne particles simulated ducks. Influenza virus-naive ferrets exposed the air space which virus-infected were processed became died, suggesting that slaughter an efficient source can infect birds mammals....
Infectious bursal disease (IBD) is one of the most important immunosuppressive diseases young chickens, causing considerable economic losses to poultry industry. More than 30 years ago, an antigenic variant (av) pathotype IBD virus (IBDV) was reported originate in, and subsequently spread among, farms in USA. Recently, a novel avIBDV lineage identified China shown exhibit clear differences its pathogenicity as well molecular characteristics compared with previously isolated strains. In this...
Fowl adenovirus (FAdV) is an infectious pathogen causing economic loss to the poultry industry worldwide. Nationwide surveillance was performed determine prevalence and distribution of FAdV with 725 samples collected from145 broiler farms in South Korea. A total 64 strains were identified using PCR phylogenetic analysis based on a sequence hexon gene; 23 FAdV‐11/D, 19 FAdV‐5/B, 12 FAdV‐8b/E. FAdV‐1/A FAdV‐8a/E three strains, respectively; only one strain FAdV‐2/D detected, there no FAdV‐4/C....
Epidemiology of Eimeria species in poultry flocks is important to increase the effectiveness vaccinations and prophylactic strategies on chicken farms. In this study, fecal samples from 356 farms were collected randomly examined for prevalence species. Through microscopic examination, it was determined that 78.7% tested positive Eimeria-infection. Seven detected all by PCR amplification internal transcribed spacer 1 (ITS-1) region with species-specific primers. E. acervulina tenella most...
Broccoli extract (BE) has numerous beneficial effects on human health including anticancer activity. Quorum sensing (QS), mediated by self-produced autoinducer (AI) molecules, is a key process for the production of virulence determinants in pathogenic bacteria. BE suppressed AI-2 synthesis and AI-2-mediated bacterial motility dose-dependent manner Escherichia coli O157:H7. In addition, expression ler gene that regulates AI-3 QS system was also diminished response to treatment with BE....
In January 2014, an outbreak of infection with highly pathogenic avian influenza (HPAI) A(H5N8) virus began on a duck farm in South Korea and spread to other poultry farms nearby. During this outbreak, many sick or dead wild birds were found around habitats frequented by migratory birds. To determine the causes death, we examined 771 bird carcasses identified HPAI 167. Gross histologic lesions observed pancreas, lung, brain, kidney Baikal teals, bean geese, whooper swans but not mallard...
Avian pathogenic Escherichia coli (APEC) causes colibacillosis, which is an economically important disease in the poultry industry worldwide. The present study investigated O-serogroups, phylogenetic groups, antimicrobial resistance, and existence of virulence-associated genes (VAGs) resistance 125 APEC isolates between 2018 2019 Korea. group B2 were confirmed for human-related sequence types (STs) through multi-locus typing (MLST). O-serogroups O2 (12.5%) O78 (10.3%) B1 (36.5%) A (34.5%)...
The present study reports the clinical, virological and pathological findings observed in a natural outbreak of highly pathogenic avian influenza farmed commercial ducks. ducks developed clinical signs, including mild respiratory distress, depression, diarrhoea, loss appetite increasing mortality (up to 12%). At necropsy, multifocal mottled necrosis was commonly found pancreas with splenomegaly, hepatomegaly, swollen kidneys. Microscopically, there necrotized pancreatitis hepatitis,...
Salmonella enterica serovar Gallinarum (Salmonella Gallinarum) is the causative agent of fowl typhoid (FT), a severe systemic disease chickens that results in high mortality. Since 1992, FT has become one most serious bacterial diseases poultry Korea. The purpose this study was to investigate prevalence during 2000 2008 and characterize phenotype genetic diversity isolates before after adopting national-wide vaccination with live attenuated strain (SG 9R) 2001. For 9 yr, total 983 farms were...
The pathogenicity of a fowl adenovirus serotype-1 (FAdV-1, K181 strain) isolated from case gizzard erosion in layer chickens was investigated specific-pathogen-free (SPF) chicks. One-week-old SPF chicks were inoculated orally or intramuscularly with the isolate FAdV-1 and euthanized for necropsy at 7, 14, 21 d postinoculation. Although there no clinical signs after inoculation, erosions observed grossly virus recovered gizzards chickens. Histologically, that infected orally, lesions found...
The aims of this study were to determine if the chicken embryo lethality assay and presence 9 virulence-associated genes Escherichia coli correlated discover which virulence contributed most lethality. We examined 58 E. strains isolated from visceral organs chickens with colibacillosis for (fimC, tsh, fyuA, irp2, iucD, cvi/cva, iss, astA, vat) by PCR. gene FimC (type I fimbriae) was detected highest prevalence in 93.1% isolates, followed iucD (67.24%), iss (58.62%), tsh (34.48%), cvi/cva...
Runting-stunting syndrome (RSS) in chickens, also known as malabsorption syndrome, which is characterized by mild to severe enteritis and diagnosed through typical histopathologic examination well clinical signs, results considerable economic losses. Despite the many studies carried out over decades determine etiologic agents of RSS involved disease, several outbreaks remained without elucidation of, potentially multiple, etiologies involved.