Publications by authors named "Joon-Seok Chae"

Importance: Despite advancements in herd management, feeding, and pharmaceutical interventions, neonatal calf diarrhea (NCD) remains a major global health concern. Bacteria, viruses, and parasites are the major contributors to NCD. Although several pathogens have been identified in the Republic of Korea (ROK), the etiological agents of numerous NCD cases have not been identified.

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  • Severe fever with thrombocytopenia syndrome (SFTS) is a tick-borne disease first identified in China that has spread across Asia, but there's limited data on its prevalence in cattle in South Korea.
  • A study collected 845 serum samples from grazing cattle over two years, revealing that 4.0% tested positive for SFTSV RNA, and 21.1% had immunoglobulin G antibodies against it.
  • The research identified several genotypes of SFTSV and suggests the need for ongoing monitoring of the virus in cattle and other animals to understand its genetic diversity and potential impact on human health.
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Background: Rodents are recognized as major reservoirs of numerous zoonotic pathogens and are involved in the transmission and maintenance of infectious diseases. Furthermore, despite their importance, diseases transmitted by rodents have been neglected. To date, there have been limited epidemiological studies on rodents, and information regarding their involvement in infectious diseases in the Republic of Korea (ROK) is still scarce.

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The causative agent of severe fever with thrombocytopenia syndrome (SFTS) is Bandavirus dabieense, an emerging tick-borne zoonotic pathogen. Migratory birds have often been suggested as potential carriers of ticks that can transmit Bandavirus dabieense; however, their role remains unclear. The Republic of Korea (ROK) holds an important position as a stopover on the East Asian-Australasian Flyway.

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Severe fever with thrombocytopenia syndrome (SFTS) is a life-threatening viral zoonosis. The causative agent of this disease is the Dabie bandavirus, which is usually known as the SFTS virus (SFTSV). Although the role of vertebrates in SFTSV transmission to humans remains uncertain, some reports have suggested that dogs could potentially transmit SFTSV to humans.

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Tick-borne diseases have a significant impact on human and animal populations, posing an increasing threat to public health, particularly in the context of climate change. Along with the various natural hosts of ticks, birds play a notable role in transmitting ticks and tick-borne pathogens, indicating the importance of monitoring flyways and establishing a cooperative network for comprehensive surveillance and to collect diverse tick samples across various regions. This study aimed to develop an international network for surveillance of disease, collection of sufficient tick samples, and overall identification of the geographical distribution of host and ticks in Asian regions, especially in 11 countries on East Asian and Central Asian flyways.

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is an obligate coccidian parasite that causes enteric diseases in bovine species. A double-stranded RNA virus associated with oocysts, virus-1 (CSpV1), has been characterized. However, the relationship between the abovementioned coccidian parasite and the virus has not been studied in the context of the known clinical outcomes.

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Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease caused by , which belongs to the genus , family , and order Bunyavirales. It has been found in tick species, various animals, and humans. The aim of this study was to detect RNA of antigens and antibodies against SFTS virus (SFTSV) among poultry such as chickens, ducks, and wild geese from five provinces in the Republic of Korea (ROK).

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Severe fever with thrombocytopenia syndrome (SFTS) is an emerging zoonotic tick-borne disease in East Asia caused by the SFTS virus (SFTSV). It is to investigate the presence of SFTSV RNA and antibodies in horses from a slaughterhouse and equestrian centers in the Republic of Korea (ROK). A prevalence study of SFTSV-specific RNA and antibodies was designed from 889 horses in the ROK.

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Severe fever with thrombocytopenia syndrome (SFTS) is a zoonotic disease, and its clinical information and prevalence are important. This study was conducted on 22 feline patients from the Republic of Korea (ROK), suspected to suffer from a tick-borne disease. Four cats were positive for SFTS, and genotypes B-1, B-3, D, and F were identified.

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Severe fever with thrombocytopenia syndrome (SFTS) is a zoonotic disease with a high mortality rate for humans and cats. The clinical course and prognosis of SFTS in dogs remains unclear. In the present study, we investigated the clinical and epidemiological characteristics of SFTS virus (SFTSV) infection in dogs.

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  • A research study collected nearly 3,900 ticks from Deogyusan National Park in Korea between April 2016 and June 2018, finding a total infection rate of 6.0% for SFTSV, with slightly higher rates in nymphs (6.0%) compared to adults (5.3%).
  • The genetic analysis revealed 17 different haplotypes of SFTSV, predominantly clustering into two groups, indicating that the strains found in Korea are more closely related
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Background: Emergent and re-emergent canine tick-borne infections are attracting increasing attention worldwide. The rise in pet ownership and the close relationship between dogs and their owners are the most concerning factors because dogs may act as competent reservoirs for human tick-transmitted infectious agents.

Objectives: This study contributes to the epidemiological surveillance of canine tick-transmitted infections with zoonotic risk in the Republic of Korea (ROK) by investigating the seroprevalence of the pathogens, spp.

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Babesiosis is a tick-borne disease caused by intraerythrocytic protozoa belonging to the genus that is primarily transmitted through Ixodid ticks and is highly pathogenic to ruminants, horses, pigs, dogs, cats, and in some cases, even humans. is considered an increasing threat to animal and human health. In this study we report infection in Korean water deer ().

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Rictularia jiyeoni n. sp. from the small intestine of the striped field mouse, Apodemus agrarius, in Korea, is described and illustrated.

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Severe fever with thrombocytopenia syndrome (SFTS) is caused by infection with Dabie bandavirus [formerly SFTS virus (SFTSV)] and is an emerging zoonotic disease. Dogs can be infected with SFTSV, but its pathogenicity and transmissibility have not been fully elucidated. In experiment 1, immunocompetent dogs were intramuscularly inoculated with SFTSV.

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Infectious calf diarrhea is one of the most significant diseases of neonatal calves. This study is conducted to identify the prevalence of pathogens in calf diarrhea for 2 years. A total of 544 feces samples from Korean native beef calves were obtained to investigate selected seven pathogens causing calf diarrhea: bovine rotavirus, bovine coronavirus, , bovine viral diarrhea virus, species, K99, and species.

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Severe fever with thrombocytopenia syndrome (SFTS) is caused by Dabie bandavirus that belongs to the genus Bandavirus in the family Phenuiviridae and order Bunyavirales and is transmitted by hard ticks. It has been detected in several tick species, various animals, and humans. The purpose of this study was to detect SFTS virus (SFTSV) antigen and antibody in wild boar in the Republic of Korea (ROK).

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  • The study examined the contamination rates of pathogenic bacteria in 1739 vegetable samples from agricultural wholesale markets in Incheon, South Korea, over a year-long period.
  • Results showed an average prevalence rate of 5.8% for vegetables, peaking in July at 15.7%, with water dropwort exhibiting the highest contamination rate at 28.6%.
  • The findings emphasize the need for effective sanitation practices in agriculture and monitoring systems to ensure consumer safety against foodborne illnesses.
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In this study, we intended to describe an unrecorded species of heterophyid trematode recovered from the small intestine of a Korean raccoon dog, Nyctereutes procyonoides koreensis, in Korea. A total of 13 small flukes were collected from a deceased Korean raccoon dog which was found in Chuncheon-si, Gangwon-do, Korea in May 2017. The trematode body were covered with many small spines, rectangular, broader than long, 807-1,103 µm long and 1,270-1,550 µm wide.

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  • The study investigates the prevalence of a zoonotic bacterium in various animals in the Republic of Korea and evaluates their potential as sources for human infection.
  • A total of 592 blood samples from different animal species showed that Korean-native goats had the highest infection rate (22.7%), followed by dairy (16.4%) and beef cattle (15.2%).
  • The findings indicate that these animals, especially goats and cattle, are significant reservoirs for the bacteria, highlighting the need for further research on its pathogenicity in humans.
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  • * Two main pathogens, Borrelia sp. and Rickettsia sp., were identified using PCR techniques, demonstrating a detection rate of 6.8% for Borrelia and 36.5% for Rickettsia among the ticks analyzed.
  • * This study marks the first identification of these pathogens in O. sawaii and the new species in Korea, indicating that these ticks may play a significant role in spreading diseases that could impact public health in Asia.
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Anaplasmosis, a tick-borne disease with multiple reservoirs, has been evolving in its pathogenesis, increasing domestic ruminants susceptibility to simultaneous infections with multiple pathogens. However, there is limited information regarding anaplasmosis in domestic ruminants in the Republic of Korea (ROK). We aimed to evaluate the role of Korean cattle and goats in infection maintenance.

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Severe fever with thrombocytopenia syndrome (SFTS) is an emerging zoonotic disease, which causes high fever, thrombocytopenia, and death in humans and animals in East Asian countries. The pathogenicity of SFTS virus (SFTSV) remains unclear. We intraperitoneally infected three groups of mice: wild-type (WT), mice treated with blocking anti-type I interferon (IFN)-α receptor antibody (IFNAR Ab), and IFNAR knockout (IFNAR) mice, with four doses of SFTSV (KH1, 5 × 10 to 5 × 10 FAID).

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The field distribution of the oral rabies vaccine is effective in controlling the spread of rabies. The present study aimed to investigate efficient distribution locations based on the environment, contact rate, and consumption by target wildlife species in South Korea. The target species (Korean raccoon dogs, domestic dogs, and feral cats) accounted for 945 contacts (52.

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