• Korean Journal of Veterinary Pathology
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• v.1 no.1
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• pp.61-65
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• 1997

Epizootic streptococal infction is one of the common disease in guinea pig. We have confirmed 54 case of epizootic streptococal infection in guinea pig by histopathology and epidemiology. Grossly infection is characterized by the presense one to several enlarged lymph nodes particularly of the mandible cervical lymph nodes and accompanied by pleuropneumonia. Histologically there were lymphadenitis with abscesses surrounded by loose connective tissue fibrinopurulent pneumonia pleuritis myocarditis pericarditis and peritonitis. Epidemiological survey revealed that mortality was high in young adult female(15.1%) and changeable weather season such as spring and fall. From findings it was suggested that epizootic streptococal infection of guinea pig begin to infect in breeding colony around weaning period and died from that infection at animal facility during the quarantine period.

• Journal of the korean veterinary medical association
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• v.16 no.3
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• pp.129-136
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• 1980

Present experiments were conducted to classify the epizootic skin diseases of swine and determine the etiological agent of swine parakeratosis in Korea. Twnty-three herds of swine with skin disease in Gyongbug prefecture were examined clinicopathologicall

• Journal of the korean veterinary medical association
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• v.51 no.11
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• pp.657-659
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• 2015

• Journal of fish pathology
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• v.27 no.2
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• pp.85-89
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• 2014

Water temperature is a key environmental factor controlling the epizootics of viral diseases in fish. High water temperature is associated with the rapid spread of rock bream iridovirus (RBIV) disease and with high mortality of RBIV infected fish. Although protection of fish against iridoviral disease by active immunization has been reported, little information is available concerning whether fish survived from an epizootic of iridoviral disease can naturally acquire resistance against the viral disease. In the present study, we have demonstrated that juvenile rock bream, which survived from a natural epizootic of RBIV, acquired resistance against recurrence or reinfection of RBIV, and this resistance was established during the subsequent low water temperature period. Furthermore, the possible involvement of the adaptive humoral immune response in the resistance of the juvenile rock bream was suggested by in vivo neutralization experiment.

• Korean Journal of Microbiology
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• v.30 no.3
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• pp.164-170
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• 1992

Haemorrhagic ulcer in cultured snakehead(Chann0 argus) is widespread in Korea during the summer season. Round haemorrhagic ulcers as the main symptom of this epizootic disease can be found on the skin of the head. body, as well as fins of this fish. This study was conducted to investigate the pathology of this disease. First. Aeromonas veronii. the dominant species. was isolated from diseased snakeheads. Then this bacterium was injected into healthy snakeheads hypodermically. Such injection was found to induce haemorrhagic ulcers very similar to those observed in naturally infected fish. One or two days afier the injection, a red spot developed around the injection site. and grew bigger to from a red area. This enlarged area then developed into haemorrhagic ulcer, accompanied by substantial skin loss. Within five days. muscle necrosis proceeded to the extent that a perforation was made between the injection site and the opposite side. The fifty per cent lethal dosage was found to be $1\times10^{5}$CFU/0.25 ml by intraperitoneal injection. The results of this experiment lead us to conclude that Arromonas veronii is a major bacterium which causes haemorragic ulcer in cultured snakcheads.

• Korean Journal of Poultry Science
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• v.8 no.1
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• pp.15-24
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• 1981

A study was conducted to determine whether the vaccination programs for the control of New castle disease (ND) would affect the immune status of birds against the disease. Twenty-six poultry flocks in the epizootic area of ND were surveyed to investigate the level of urn antibody against ND virus and the programs used for the vaccination of birds. The mortality rates and vaccination status of birds during the epizootic of ND were also examined in the infected poultry flocks to elucidate the immune effect against the epizootic with particular regard to various vaccination programs used in the field. The results obtained are summerized as follows: 1. Of 26 poultry flocks investigated, 22 flocks were immunized with live and killed vaccines, their haemagglutination-inhibition (HI) antibody titer being 146 and 50, respectively. Among 22 farms using live and killed vaccines two flocks which showed the lowest HI titer of 10 and 23 had the disease later on. However, no cases of ND were recorded in the killed vaccine groups, although their HI titers were in the range of 38 to 64. 2. Of 14 infected flecks, one flock was not vaccmated against ND while all the remaining 13 flocks were vaccinated against the disease, of which 8 flocks were vaccinated with live vaccine only and the other 5 flocks with both live and killed vaccines. The mortality rate of 8 infected flocks which had been vaccinated with only live vaccine was as high as 32.5% while that of 5 flocks with both live and killed vaccines was as low as 5.1%. 3. It was found that in majority of flocks B$_1$vaccine was used via drinking water and in a few flocks the vaccine was administered via intramuscular route or method of dipping mouth, nose and eye of birds into vaccine solution.

• Korean Journal of Veterinary Research
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• v.27 no.1
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• pp.69-76
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• 1987

An epizootic of calf diarrhea occurred in an extensive dairy farm located in Gangwondo province in December of 1985. The patients showing fever, chills, complete anorexia and watery diarrhea sometimes dysentery were concentrated among the calves ranged from 8 days to 3 months old and many of them died in acute course. The five carcases were examined by pathological and bacteriological means. The predominant gross lesions were edematous swelling of the mesenteric lymph nodes, profuse catarrhal or diphtheritic enteritis and extensive purulent bronchopnenomonia or lobar fibrinous pneumonia. Microscopically the lesions of the liver and spleen were characterized by coagulative necrotic foci and granulomatous nodules. The spleen and lymph node showed also proliferative changes of reticular cells and involution of intestinal lymphatic nodules were noticed. The strains of Salmonella(S) species isolated from the liver, spleen, bile juice, peritoneal fluid and thoracic fluid were identified serologically as S. dublin. These clinical and pathological findings of the disease were those of acute enteritis form of salmonellosis and characterized by high morbidity and mortality among the calf herd. The report also signifies the first description of an epizootic of bovine salmonellosis caused by S. dublin in Korea.

• Journal of the korean veterinary medical association
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• v.33 no.2
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• pp.90-100
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• 1997

Outbreaks of transmissible gastroenteritis(TGE) in 52 farrow-to-finish farms in southeastern part of Korea(Youngnam district) were investigated during the period from November, 1992 to April 1993. The disease invariably occurred in so called epizootic for

• Journal of Marine Life Science
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• v.7 no.1
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• pp.10-14
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• 2022

Monitoring infectious diseases for fishery species takes a key role in preventing disease emergence and spreading of cultured fishery species. This research has examined a total of 1,115 fishes of four species (leather carp, fancy carp, stone moroko, carassius auratus) at 23 farm in Jeollanamdo and Jeollabukdo in 2021 for pathogen infection. As a result of disease screening for three legally designated diseases (SVC, Spring viraemia of carp, EUS, Epizootic ulcerative syndrome, and KHVD, Koi herpesvirus disease), no infectious diseases were detected in all examined samples; cyprinid fish studied in Jeolla province would provide important information for declaring a disease-free nation or disease-free region.

• Journal of Veterinary Science
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• v.21 no.2
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• pp.38.1-38.24
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• 2020

African swine fever (ASF), caused by the ASF virus, a member of the Asfarviridae family, is one of the most important diseases in the swine industry due to its clinical and economic impacts. Since the first report of ASF a century ago, ample information has become available, but prevention and treatment measures are still inadequate. Two waves of epizootic outbreaks have occurred worldwide. While the first wave of the epizootic outbreak was controlled in most of the infected areas, the second wave is currently active in the European and Asian continents, causing severe economic losses to the pig industry. There are different patterns of spreading in the outbreaks between those in European and Asian countries. Prevention and control of ASF are very difficult due to the lack of available vaccines and effective therapeutic measures. However, recent outbreaks in South Korea have been successfully controlled on swine farms, although feral pigs are periodically being found to be positive for the ASF virus. Therefore, we would like to share our story regarding the preparation and application of control measures. The success in controlling ASF on farms in South Korea is largely due to the awareness and education of swine farmers and practitioners, the early detection of infected animals, the implementation of strict control policies by the government, and widespread sharing of information among stakeholders. Based on the experience gained from the outbreaks in South Korea, this review describes the current understanding of the ASF virus and its pathogenic mechanisms, epidemiology, and control.