• 한국동물위생학회지
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• 제40권2호
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• pp.83-87
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• 2017

59 strains of Salmonella enterica subspecies enterica serovar Typhimurium (S. Typhimurium) were isolated from pigs in Gyeongbuk province, collected from 2011 to 2016. The isolates were investigated for the presence of antimicrobial resistance and multi drug resistance patterns. All 59 S. Typhimurium isolates were resistant to at least one of 10 antibiotics used in this study, 100% of S. Typhimurium isolates from pigs were resistant to two or more antimicrobials. As many as 5 isolates of isolates from pigs were resistant to 8 of 10 antimicrobials tested in this study. The ACSTNaGmKNaCf, ACSTGmAuKT/S, ACSTGmKCfT/S resistance phenotype was observed in 3.4%, 3.4%, 1.7% of the 59 isolates, respectively.

• 한국동물위생학회지
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• 제26권1호
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• pp.39-50
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• 2003

Non-typhoidal Salmonella serovars remain a potential threat to human health and many animals including beef cattle, broiler chickens, and pigs which possible sources of non-typhoidal salmonellosis in human. In this study, the cecal contents of slaughtered pigs were examined for Salmonella serovar prevalence. The characteristics of the isolates, including antimicrobial resistance patterns and virulence genes, were studied along with the reference strain S typhimurium ATCC 13311. Out of 640 sample, 137 Salmonella(21.4%) were isolated and their serovar were identified S typhimurium 83 strains(60.6%), S agona 10 strains(7.3%), S schwarzengrund 4 strains(2.9%), S derby 4 strains(2.9%), S ayinde 1 strains(0.7%), and untypable 35 strains(25.5%). All 83 S typhimurium strains(100%) were multi-drug resistance to at least 7 antibiotics, and 20 strains(24.1%) of 83 isolates were R-type ACSSuT. Examination of virulent gene by PCR revealed that 73 S typimurium field isolates(88%) have a invA gene and 24 strains(28.9%) have a spvC gene. Consequently, S typhimurium infection in slaughtered pigs was relatively to appear high prevalence in their herds which suggested that it should be necessary for herd health monitoring and surveillance.

• 한국식품위생안전성학회지
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• 제31권6호
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• pp.471-475
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• 2016

살모넬라증은 가축에 심각한 피해를 유발하는 질병으로, 축산업과 식품산업에 많은 경제적 손실을 초래하고 있다. 본 연구에서는, 복합 인산염을 주성분으로 하는 분말 소독제의 Salmonella Typhimuriums에 대한 살균효과 시험을 수행하였다. 배지희석법을 이용한 살균효력시험은 $4^{\circ}C$에서 30분 동안 시험 세균을 희석 소독제에 노출시켜 소독제의 가장 효과적인 낮은 희석배수를 결정하는 시험이다. 본 분말 소독제와 시험 세균을 처리조건에 따라 경수와 유기물로 희석하여 반응을 시켰다. 유기물 조건에서, Salmonella Typhimurium에 대한 소독제의 살균력은 경수조건에서의 살균력과 비교하여 낮게 나타났는데, 이는 유기물들에 의한 소독제의 살균 유효성분에 대한 저해작용에 따른 것으로 사료된다. 분말 소독제는 Salmonella Typhimurium과 같은 병원체에 대해 살균효과를 가지므로, 살모넬라증과 같은 세균성 질병의 확산을 제어하는데 효과적으로 이용될 수 있을 것으로 사료된다.

• 미생물학회지
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• 제27권2호
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• pp.147-154
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• 1989

Vibrio vulnificus Lipopolysaccharide (LPS) was extracted, performed chemical analysis, tested its biological activities, and compared to those of Escherichia coli LPS and Salmonella typhimurium LPS. The lethal activity of V. vulnificus LPS was 138.6138.6 mg/kg in mouse, but this was lower than thowe of E. coli LPS (56.3 mg/kg) and S. typhimurium LPS (37.5 mg/kg). The result of fatty acid analysis showed that V. vulnificus LPS had more saturated fatty acid than E. coli LPS and S. typhimurium LPS. Above results indicated that V. vulnificus LPS did not have much effect on the lethality. The results of biological responses of enzymes and blood cells by LPSs showed that V. vulnificus LPS had slightly greater activity than E. coli LPS and S. typhimurium LPS. V. vulnificus LPS was recommendavle for stimulant on interferon induction because of adequate stimulation and safety for host and cell lines.

• 대한미생물학회지
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• 제21권4호
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• pp.455-460
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• 1986

This study was undertaken to investigate to know whether spleen and lymph node cells from immunized mice can transfer systemically the delayed-type hypersensitivity(DTH) reaction to Salmonella typhimurium and to characterize the lymphoid cells using glass, nylon wool and rabbit anti-mouse thymocyte serum. Mice, C57BL/6 or ICR, were immunized subcutaneously at 11, 8 and 2 days before adoptive systemic transfer with $100{\mu}g$ of protein antigen from S. typhimurium in complete Freund adjuvant. It was found that DTH reaction to S. typhimurium could be transferred to normal recipient systemically by both spleen and lymph node cells($10^8\;cells$, respectively) from immunized mice. The cells responsible for this transfer of DTH reaction were glass nonadherent T lymphocytes.

• 한국축산식품학회지
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• 제18권3호
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• pp.269-275
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• 1998

The purpose of this study was to determine the thermal inactivation of Salmonella enteritidis, Salmonella typhimurium and E. coli O111 in liquid cultures treated with microwave energy. Furthermore, this study was to introduce new methodologies for studying nonthermal microwave effects on microorganisms, using controlled microwave energy and specially designed apparatuses. For the automatic temperature control during microwave heating, the real time data acquisition and computation system is designed with BASIC routine. The automatic temperature control system used in the experiments perform relatively stable control at the experiment temperature of 45, 50, 55 60$^{\circ}C$ and 65$^{\circ}C$ for 30 minutes. The effects of microwave heating on liquid cultures was compared with that of conventional heating, still reduces effectively the number of pathogenic bacteria in liquid cultures. While no particular differences between microwave heating and conventional heating was observed in the activation of E. coli at 45$^{\circ}C$ test, the activation of Sal. enteritidis and Sal. typhimurium was slightly reduced during the microwave treatments.

• 한국동물위생학회지
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• 제32권2호
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• pp.147-153
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• 2009

Salmonella species are the most important etiologic agents of food-borne acute gastroenteritis. The most common serotypes isolated from humans are Salmonella enterica serotype Typhimurium (S. Typhimurium) and S. Enteritidis. Traditional detection methods for Salmonella are based on cultures using selective media and characterization of suspicious colonies by biochemical and serological tests. These methods are generally time-consuming and not so highly sensitive. Recently, the polymerase chain reaction (PCR) has been used as a highly sensitive, specific, and rapid test for the presence of pathogenic bacteria. In this study, a multiplex PCR (m-PCR) was used to detect S. Typhimurium and S. Enteritidis. We selected m-PCR target genes, which were the spv (virulence plasmid specific for S. Enteritidis) and sefA (S. Enteritidis fimbrial antigen) genes, fliC (H1-i antigen specific for S. Typhimurium) and a randomly cloned sequence specific for the genus Salmonella. With m-PCR, random sequence was detected from all strains of Salmonella spp, spv and sefA were detected from all strains of S. Enteritidis (100%), and fliC was detected from all strains of S. Typhimurium (100%). This assay indicate that the specificity of the m-PCR make them potentially valuable tools for detection of S. Typhimurium and S. Enteritidis.

• 생명과학회지
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• 제15권4호
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• pp.641-646
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• 2005

Salmonella typhimurium TML이 Int-407 숙주세포에 부착하는 정도는 S. typhimurium이 낮은 농도의 철이 함유된 배지에서 배양되었을 때보다 LB 액체배지 또는 높은 농도의 철이 함유된 배지에서 생육한 것에서 약 10배 정도의 높은 수준으로 관찰되었다. 고농도의 철이 포함된 배양조건이 살모넬라가 숙주세포에 부착시키는 정도를 향상시키는데 반해, 칼슘, 코발트, 구리, 인산, 마그네슘 그리고 망간과 같은 다른 양이온은 그렇지 않다. 이것은 아마도 철이 Salmonella가 부착에 필요한 요소들의 발현을 활성화하는 역할을 하는 것으로 추정된다. 철 농도에 따른 부착정도의 차이들은 type 1 fimbriae, mannose resistant hemagglutinin과 flagellum등을 생성하지 않는 다양한 S. typhimurium 돌연변이주들에서도 관찰되는 것으로 미루어보아 이들 구조체들과 상관이 없는 밝혀지지 않은 어떤 인자가 부착성 증가에 관여하는 것으로 사료된다. fur유전자가 불활성화된 S. typhimurium 돌연변이주의 부착성이 야생형 Salmonella와 유사한 방식으로 철에 의해 조절되었는데, 이는 철 농도에 따른 부착성의 변화에 관여하는 잠재적인자의 발현이 Fur 단백질과 독립적으로 이루어진다는 것을 나타낸다.

• 한국동물위생학회지
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• 제34권3호
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• pp.217-226
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• 2011

Salmonella spp. is of increasing public health concern as causative pathogens of food poisoning. The aim of this study was to investigate the serotypes and antimicrobial resistance pattern of Salmonella spp. isolated from duck farms in Daegu-Gyeongbuk province. Also, S. Enteritidis and S. Typhimurium isolates were further examined for plasmid analysis, phage typing and pulsed-field gel electrophoresis (PFGE). A total of 34 Salmonella spp. (16.4%) were isolated from duck farms and ten serotypes were identified. The predominant serotypes were S. Typhimurium (23.5%) S. Fyris (17.6%) and S. Haardt (11.8%), S. Agona and S. Enteritidis (respectively 8.8%). Of 34 Salmonella isolates, 15 (44.1%) isolates were resistant to at least one antimicrobial agent and multiple resistance (resistance to more than 4 drugs) was observed in 9 strains (26.5%). The high resistance was found to streptomycin (32.4%), tetracycline (29.4%), ampicillin, kanamycin and nalidixic acid (respectively, 26.5%), all Salmonella isolates were susceptible to cefoxitin, cefotaxime, gentamicin, amikacin and ciprofloxacin. All S. Enteritidis and S. Typhimurium isolates were found to contain only one plasmid (ca. 54 or 55kb, respectively). Among the S. Enteritidis isolates, two phage types were found, PT32a and PT1c, respectively, one isolates did not react with any of the phages used. Whereas, all S. Typhimurium isolates were RDNC (reacts but does not conform). PFGE showed to be a useful typing method better than plasmid analysis and phage typing for discrimination of isolates especially, S. Typhimurium isolates. Our results indicated that the serotypes of Salmonella isolates are widely distributed in duck farms, further epidemiological studies should be carried out.

• 대한화학회지
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• 제54권2호
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• pp.215-221
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• 2010

살모넬라는 음식과 식수에서 흔히 나오는 중요한 병원체로 세계 곳곳에서 급성 위장염과 같은 감염증을 일으키며, 일반적으로 인간의 혈청형 임상종으로는 Salmonella enterica의 혈청형인 S. Typhimurium과 S. Enteritidis가 있다. 일반적인 검출 방법으로 살모넬라를 기본으로 하여 선택적인 배양으로 샘플을 수집하였고 살모넬라를 일으키는 군체의 특징을 생화학과 혈청학상인 테스트를 하였으나 이러한 방법들은 일반적으로 시간이 걸리고 높은 감도를 보이지 않았다. 최근, 등온증폭반응법과 real-time PCR법을 이용하여 높은 감도, 특이성으로 현재 병원성 박테리아에 빠르게 수행할 수 있게 되었다. 본 연구에서는 등온증폭반응과 real-time PCR법을 사용하여 S. Typhimurium과 S. Enteritidis의 검출하였다. 선택적인 타겟 유전자로, invA를 살모넬라종의 염기서열에 특이적으로 임의복제 하였다. 등온증폭반응과 real-time PCR은 살모넬라종으로부터 임의의 염기서열을 증폭하여 검출하였고, invA는 S. Typhimurium과 S. Enteritidis의 두 가지 종을 모두 검출하였다. 이러한 등온증폭반응과 real-time PCR법으로 S.Typhimurium과 S. Enteritidis의 검출 가능성을 보였으며, 살모넬라 종에 대한 특이성, 민감성을 갖춘 유용한 검출방법을 제시하였다.