• 대한수의학회지
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• 제35권1호
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• pp.107-113
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• 1995

Four Holstein calves 7-day-old were infected with C parvum oocysts for parasitological and pathological investigations of bovine cryptosporidiosis. Of those calf 1 was orally administered with $7{\times}10^6$ oocysts of C parvum isolated from a Korean mouse (VRI-CN91), and calf 2 with same number of C parvum oocysts provided by Washington State University(WSU). The rest (calf 3 and 4) were orally administered with $1{\times}10^8$ oocysts of VRI-CN91 strain. Calf 1 commenced to discharge oocysts in feces at days 6 post inoculation(PI), and it reached a peak $1.4{\times}10^7$ oocysts per gram of feces(OPG) on day 8 PI. Calf 2 commenced to discharge oocysts in feces at day 4 PI, and it reached a peak $3.75{\times}10^6$ OPG on day 7 PI. Calf 3 and 4 commenced to discharge oocysts in feces at day 3 and day 4 PI, and it reached a peak on day 7 PI (calf 3, $7.8{\times}10^6$ OPG; calf 4, $1.7{\times}10^6$ OPG). Clinically, the calves began to show mucoid-watery diarrhea at day 3 to 5 PI, and the sign lasted 5 to 7 days. Calf 2 died on day 9 PI with a severe dehydration. On necropsy the intestine was found to be congested and hemorrhagic. Protozoan oocysts were observed mainly in the ileum and occasionally in jejunum. The results in the present study indicate that the Korean isolate was pathogenic in calves.

• 한국임상수의학회지
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• 제24권2호
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• pp.264-268
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• 2007

Three German Shepherd dogs (5 years old, 30 kg, male; 4 years old, 23 kg, female; 4 years old, 24 kg, female) with history of acute vomiting, hemorrhagic diarrhea, anorexia and dullness were admitted to veterinary clinic in the military working dogs training corp (MWDTC). All of them showed same symptoms after ingestion the $'PREVNTIC^{(R)}'$ collar to control ecto-parasites infection in field. One dog was operated by gastrotomy and the $5{\sim}6$ pieces of the $'PREVNTIC^{(R)}'$ collar were removed. The dog was completely cured by intensive care within 2 hours after $'PREVNTIC^{(R)}'$ collar ingestion. However, two dogs were operated by gastrotomy and intensive care over 24 hours after $'PREVNTIC^{(R)}'$ collar ingestion but died. In autopsy, the $5{\sim}6$ pieces of hard materials were found in the stomach, and severe thickness, congestion hemorrhage and swelling of the stomach walls and mucous membrane were observed. In these cases, it was suggested that the first aid of treatment such as gastrotomy within two hours after $'PREVNTIC^{(R)}'$ collar ingestion as soon as possible was helpful for attenuating of toxicosis.

• Journal of Microbiology and Biotechnology
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• 제33권5호
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• pp.559-573
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• 2023

Shiga toxin (Stxs)-producing enterohaemorrhagic Escherichia coli (EHEC) and Shigella dysenteriae serotype 1 are major causative agents of severe bloody diarrhea (known as hemorrhagic colitis) and hemolytic uremic syndrome (HUS) associated with extraintestinal complications such as acute renal failure and neurologic impairment in infected patients under 9 years of age. Extreme nephrotoxicity of Stxs in HUS patients is associated with severe outcomes, highlighting the need to develop technologies to detect low levels of the toxin in environmental or food samples. Currently, the conventional polymerase chain reaction (PCR) or immunoassay is the most broadly used assay to detect the toxin. However, these assays are laborious, time-consuming, and costly. More recently, numerous studies have described novel, highly sensitive, and portable methods for detecting Stxs from EHEC. To contextualize newly emerging Stxs detection methods, we briefly explain the basic principles of these methods, including lateral flow assays, optical detection, and electrical detection. We subsequently describe existing and newly emerging rapid detection technologies to identify and measure Stxs.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제9권2호
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• pp.183-192
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• 2006

목 적: HS 자반증 환아에서 선행 질환, 위장관 증상 유무, 그리고 검사 소견의 차이에 따른 임상 경과의 차이가 있는지를 알아보고자 본 연구를 시행하였다. 방 법: 1996년 1월부터 2006년 4월까지 한양대학교병원 소아과에 입원하였던 HS 자반증 환아 중 피부 증상 외 다른 증상 없이 위장관 증상을 호소하는 환아와 위장관 증상을 호소하지 않은 환아 104명을 대상으로 급성 감염 병력, 입원 기간, 치료, 재발 여부를 조사하였고, 말초 혈액 검사, 대변 잠혈 반응 검사, 복부 초음파 검사, 위장관 내시경 검사를 시행하여 그 결과를 비교 관찰하였다. 결 과: HS 자반증 환아 104명 중 위장관 증상이 있는 환아는 66명(63.5%)이었고, 위장관 증상이 없는 환아는 38명(36.5%)이었다. 위장관 증상 유무에 관계없이 6~10세 연령군이 가장 많았고, 위장관 증상이 있는 군에서는 남아가 더 많았으나 위장관 증상이 없는 군에서는 성별 차이가 없었다. 위장관 증상으로는 복통 57명(54.8%), 구토 21명(20.2%), 혈변 5명(4.8%), 설사 3명(2.9%), 오심 3명(2.9%)으로 복통이 가장 많았다. 또한 위장관 증상이 하나인 경우가 46명(44.2%)이었고, 2개 이상을 동반하는 경우가 20명(19.2%)이었다. 위장관 증상이 많은 환아와 위장관 내시경 검사를 시행한 군에서 입원 기간이 길었으며, 스테로이드 치료 시행 예와 질병의 재발이 더 많았고, 대변 잠혈 반응 검사에서 통계학적으로 의의가 있었다(p<0.05). 재발 환자와 재발하지 않은 환자와의 비교에서는 통계학적 의의가 관찰되지 않았다. 87명에서 복부 초음파 검사를 시행하였고, 6명(6.9%)에서 소장벽이 두꺼워진 소견이 관찰되었다. 위장관 내시경 검사상 병변의 양상에 따른 빈도는 급성 출혈성 위염과 급성 출혈성 십이지장염 6명(40.0%), 십이지장 궤양 3명(20.0%), 급성 출혈성 위염과 십이지장 궤양 3명(20.0%), 십이지장염과 출혈성 대장염 2명(13.3%), 출혈성 대장염 1명(6.7%) 순으로 관찰되었고, 급성 출혈성 위염과 급성 출혈성 십이지장염이 동반된 경우가 가장 많았다. 치료는 30명(28.8%)에서 시행되었고, 재발은 6명(5.7%)에서 관찰되었으나 모두 1회였고, 추적 관찰이 되지 않은 3명을 제외하고는 치료한 환아와 치료하지 않은 환아 모두 증상이 호전됨을 알 수 있었다. 결 론: HS 자반증 환아에서 적극적인 위장관 점막병변에 대한 검토가 잘 이루어질 경우 환아의 진단과 치료에 도움이 될 것이라 생각된다.

• Journal of Microbiology and Biotechnology
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• 제28권9호
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• pp.1413-1425
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• 2018

Shiga toxins (Stxs) are the main virulence factors expressed by the pathogenic Stx-producing bacteria, namely, Shigella dysenteriae serotype 1 and certain Escherichia coli strains. These bacteria cause widespread outbreaks of bloody diarrhea (hemorrhagic colitis) that in severe cases can progress to life-threatening systemic complications, including hemolytic uremic syndrome (HUS) characterized by the acute onset of microangiopathic hemolytic anemia and kidney dysfunction. Shiga toxicosis has a distinct pathogenesis and animal models of Stx-associated HUS have allowed us to investigate this. Since these models will also be useful for developing effective countermeasures to Stx-associated HUS, it is important to have clinically relevant animal models of this disease. Multiple studies over the last few decades have shown that mice injected with purified Stxs develop some of the pathophysiological features seen in HUS patients infected with the Stx-producing bacteria. These features are also efficiently recapitulated in a non-human primate model (baboons). In addition, rats, calves, chicks, piglets, and rabbits have been used as models to study symptoms of HUS that are characteristic of each animal. These models have been very useful for testing hypotheses about how Stx induces HUS and its neurological sequelae. In this review, we describe in detail the current knowledge about the most well-studied in vivo models of Stx-induced HUS; namely, those in mice, piglets, non-human primates, and rabbits. The aim of this review is to show how each human clinical outcome-mimicking animal model can serve as an experimental tool to promote our understanding of Stx-induced pathogenesis.

• 한국동물위생학회지
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• 제32권4호
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• pp.361-368
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• 2009

Porcine proliferative enteritis (PPE) is a transmissible gastroenteric disease caused by Lawsonia intracellularis. Clinically, PPE causes hemorrhagic diarrhea and sometimes death in growing pigs, but when the disease progresses to a chronic phase, the infected pig no longer displays significant symptoms. The purpose of the present studies were carried out to determine L. intracellularis in the pig farms and slaughter house, in Gyeongnam area. A survey of proliferative enteritis in pig was conducted using polymerase chain reaction (PCR) testing method, total 1,495 samples. PCR products showed a specific band at the 210bp, 329bp in the specimens of feces and mucosal scraping. Of 420 fecal specimens, 113 (26.9%) were identified as positive to PPE. Of 1,075 mucosal scraping specimens, 109 (10.1%) were identified as positive to PPE. Of total 1,495 specimens, 222 (14.8%) were identified as positive to PPE.

• 한국동물위생학회지
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• 제32권3호
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• pp.241-249
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• 2009

Shiga toxin (Stx)-producing Escherichia coli (STEC) strains can cause broad spectrum of human disease, including diarrhea, hemorrhagic colitis, and the life-threatening hemolytic uremic colitis (HUS). We examined 868 samples was taken from bovine feces and carcass from January to December 2008 in Seoul. Twenty two (9.5%) shiga toxin -producing Escherichia coli were isolated from the 230 of bovine feces, and two (0.31%) were isolated from the 638 of carcasses. Serotype of E. coli isolates were O157 (10, 41.6%), O26 (10, 41.6%), O111 (1, 4.2%) and UT (3, 12.6%). In PCR, the isolates displayed three different stx gene combination (stx1 [2, 8.4%]), stx2 [3, 12.6%] and stx1 and stx2 [19,87.5%]). The eaeA and hlyA gene were found in 11 (45.8%) of the 24 strains. Saa gene was present only one strains (4.2%). Toxin typing using reverse passive latex agglutination test showed the same result in VT 1. But it showed different result in VT 2. In antimicrobial susceptibility test, all isolates were sensitive to amikacin, amoxicillin/clavulanic acid, ciprofloxacin and colistin. Eighteen strains (75.0%) of 24 isolates showed the multi-resistant patterns with over 3 drugs. PFGE was performed after the genomic DNA of twenty four isolates was digested with Xba I. the 24 isolates showed 7 (A~G) PFGE type.

• Tuberculosis and Respiratory Diseases
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• 제75권6호
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• pp.264-268
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• 2013

A 73-year-old, previously healthy man presented with nausea, vomiting, diarrhea, dry mouth and febrile sensation 3 hours after eating boiled wild mushrooms. After admission, he showed progressive severe respiratory distress, pancytopenia, azotemia, hypotension, hypoxemia and consolidation of the entire left lung on chest radiography. With a preliminary diagnosis of necrotizing pneumonia, he underwent left pneumonectomy in order to remove all necrotic lung tissue. Lung histology showed extensive hemorrhagic necrosis, massive inflammatory cell infiltration, prominent proliferation of young fibroblasts and the formation of an early-stage hyaline membrane along the alveolar wall. Despite aggressive treatment, including mechanical ventilation, continuous renal replacement therapy and administration of granulocyte colony stimulating factor and broad spectrum antibiotics, he died on hospitalization day 13. Subsequently, the mushroom was identified as Podostroma cornu-damae. This is the first case of a histological evidence of lung involvement by Podostroma cornu-damae poisoning in Korea.

• 동아시아식생활학회지
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• 제8권4호
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• pp.430-440
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• 1998

이상의 결과로 돼지고기는 비교적 미생물 오염도가 낮아 1kGy 조사로 저온성 미생물을 제외한 오염미생물의 생육을 검출한계 이하로 감소시킬 수 있었으며 모든 오염미생물의 살균을 위해서는 3kGy의 선량이 요구되었다. 감마선조사와 저장기간에 따른 일반성분 변화의 경우 수분함량에 있어서만이 저장기간에 따라 다소 감소되었으며, pH 및 산도는 감마선 조사에 의한 영향은 없었으나 저장기간이 경과함에 따라 pH는 증가하고 산도는 감소하는 경향을 보였다. 총 아미노산 조성에서는 가장 많이 검출된 것이 glutamic acid였고, 저장기간에 따른 함량변화는 거의 없었으며 감마선 조사에 의한 영향도 매우 미비하였다. 무기질 함량의 경우 주요 무기질성분으로 potassium, phosphorus, sodium, magnesium 순이었고 감마선 조사에 의한 조성변화는 없었다.

• Journal of Dairy Science and Biotechnology
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• 제33권1호
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• pp.59-67
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• 2015

Enterohemorrhagic Escherichia coli (EHEC) O157:H7 is well-characterized as an important food-borne pathogen worldwide and causes human diseases such as diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome (HUS) by producing shiga-like toxin (Stx). It has been reported that a number of dairy foods, including cheese, can act as the source of EHEC O157:H7 infections. In addition to the toxicity of Stx, recently it has been indicated that EHEC O157:H7 possesses virulence factors related to attachment, quorum sensing, and biofilms. Moreover, these novel virulence factors might become critical points to be considered in the future production of food derived from animals. Here, we review the evidences that support these insights on new virulence factors and discuss the potential mechanisms mediating the pathogenesis of EHEC O157:H7 in the dairy food industry.