• 제목/요약/키워드: Penicillin resistance

검색결과 229건 처리시간 0.03초

가축 분뇨 중의 항생제 내성 균주 (Abtibiotic Resistance in Gram Negative Enteric Bacteria Isolated from Feces of Domestic Animals)

  • 문경호;이종철
    • 약학회지
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    • 제30권1호
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    • pp.51-54
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    • 1986
  • Fecal samples from Kim-Hae farm animals were examined for the frequency of gram-negative enteric organisms resistant to tetracycline, streptomycin, or penicillin. The propertions of antibiotic resistant to total organisms in fecal specimens of poultry, swine and cow were as follows: 95%, 92%, 70% for tetracycline, 100%, 27%, 9% for streptomycin, 18%, 1%, 1% for penicillin, respectively. The bacteria had multiresistance to antibiotics. These strains had more than one plasmid. From the transformation study, it was concluded that the resistance to streptomycin was attributed to one of these plasmids.

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Antibiotic sensitivity and resistance of bacteria from odontogenic maxillofacial abscesses

  • Kang, Sang-Hoon;Kim, Moon-Key
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제45권6호
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    • pp.324-331
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    • 2019
  • Objectives: This study investigated the types and antibiotic sensitivity of bacteria in odontogenic abscesses. Materials and Methods: Pus specimens from 1,772 patients were collected from affected areas during incision and drainage, and bacterial cultures and antibiotic sensitivity tests were performed. The number of antibiotic-resistant bacteria was analyzed relative to the total number of bacteria that were tested for antibiotic susceptibility. Results: Bacterial cultures from 1,772 patients showed a total of 2,489 bacterial species, 2,101 gram-positive and 388 gram-negative. For penicillin G susceptibility tests, 2 out of 31 Staphylococcus aureus strains tested showed sensitivity and 29 showed resistance. For ampicillin susceptibility tests, all 11 S. aureus strains tested showed resistance. In ampicillin susceptibility tests, 46 out of 50 Klebsiella pneumoniae subsp. pneumoniae strains tested showed resistance. Conclusion: When treating odontogenic maxillofacial abscesses, it is appropriate to use antibiotics other than penicillin G and ampicillin as the first-line treatment.

무의촌균주(無醫村菌株) 및 병원균주(病院菌株)의 항균제(抗菌劑) 내성(耐性) 양상(樣相)에 관(關)한 연구(硏究) (Drug Resistance Patterns of the Bacterial Strains Isolated from Rural Areas and an Urban General Hospital)

  • 이광호;김익상;신희섭;차창용;이승훈;장우현;임정규
    • 대한미생물학회지
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    • 제15권1호
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    • pp.19-32
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    • 1980
  • Besides the benefits of antimicrobial agents in the control of various infectious diseases, widespread and prolonged use of particular antimicrobial agents has brought about the increase of drug-resistant strains in a community and the profound changes in the pattern of infectious diseases. In Korea, there are some remote villages where no clinics and drug stores are available and the residents in those areas are assumed to have fewer chances to contact with antimicrobial agents. In the present study, the differences in susceptibilities to 14 antimicrobial agents between the isolates from rural areas(R) and Seoul National University Hospital(SNUH, H) were studied. The isolates and their numbers were Staphylococcus aureus, R;55, H;68), Enterococci(R;28, H;30), Escherichia coli(R;40, H;40), Enterobacter aerogenes(R;25, H;21) and Klebsiella pneunoniae(R;58, H;67). Minimal inhibitory concentrations(MIC's) of penicillin, ampicillin, carbenicillin, cephalexin, tetracycline, oxytetracyline, doxycycline, minocycline, gentamicin, kanamycin, streptomycin, erythromycin, troleandomycin and co-trimoxazole were determined by agar dilution method. I. Comparison of MIC's and resistant strain proportions between isolates from SNUH and rural areas. MIC's and/or resistant strain proportions of the isolates from SNUH were significantly higher than those of the isolates from rural areas in the cases of 1. S. aureus to doxycycline, streptomycin and kanamycin. 2. E. coli to penicillin, ampicillin, carbenicillin, tetracycline, oxytetracycline, doxycycline, minocycline, streptomycin, kanamycin, erythromycin and co-trimoxazole. 3. E. aerogences to carbenicillin, tetracycline, oxytetracycline, doxycycline, minocycline, streptomycin, kanamycin, genaamicin and co-trimoxazole. 4. K pneunoniae to penicillin, ampicillin, tetracycline, oxytetracycline, doxycycline, monocycline, streptomycin, kanamycine, gentamicin and co-trimoxazole. However, the mean MIC and resistant strain proportion of S. aureus to tetracycline were higher in isolates from rural areas than in those from SNUH and Enterococci showed no differences in susceptibilities to the antimicrobial agents between isolates from rural areas and from SNUH. Therefore, in general, differenes in susceptibility to these antimicrobial agents between the isolates from rural areas and SNUH were remarkably greater and broader in gram negative enteric bacteria. II. Multiple drug resistance pattern. Patterns and incidences of multiple drug resistance were studied with penicillin, ampicillin, tetracycline, cephalexin, gentamicin, streptomcin, kanamycin and co-trimoxazole in Enterococci, E. coli, E. aeroges and K. pneumoniae. There appeared significant differences in the incidence of multiply drug-resistant strains and multiple drug resistance patterns between the isolates from SNUH and rural areas in Enterococci, E. coli, E. aerogenes and K. pneumoniae. However, there was no difference in the incidence of multiply drug-resistant strains between isolates of S. aureus from SNUH and rural areas but the pattern of multiple resistance of the SNUH strains of S. aureus was diverse, while that of the rural strains was predominantly confined to penicillin-tetracycline combination. The incidence of multigly drug-resistant strains and diversity of their patterns were the highest in E. coli strains isolated from SNUH and there were no multiply drug resistant strrains in Enterococci and K. pneumoniae strains isolated from rural areas. The number of drug-resistance determinants was also different between the isolates from rural areas and SNUH. Most of the multiply drug-resistant strains of E. coli, E. aerogenes and K. pneumoniae isolated from SNUH were resistant to more than 3 kinds of antimicrobial agents, most frequently to ampicillin, tetracycline and streptomycin, while multiply drug-resistant strains from rural areas were resistant to 2 kinds of antimicrobial agents among ampicillin, tetracycline and streptomycin. With drug-resistant E. coli strains, resistance to tetracycline which was used most widely since 1951 was most frequently involved as a part of mutliple drug-resistance, followed by resistance to ampicillin and streptomycin. This strongly suggests that emergence of drug-restant strains in a community is directly dependent on the selective pressure exerted by the antimicrobial agent used. III. Cross resistance. Cross resistance of bacteria was studied among tetracycline penicillin, aminoglycoside and macrolide derivatives by analyzing correlation coefficients of sucseptibilities using the least square method. In this study, there were high correlations among the susceptibilities to related derivatives. It appears that the relatively low correlations in susceptibilities present in some cases are due to intrinsic resistance of E. aerogenes to penicillin, Enterococci to aminoglycoside and E. coli E. aerogenes and K. pneumoniae to macrolide derivatives.

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가금유래 주요병원성세균의 분리와 분리균주에 대한 약제감수성조사 (Isolation of the Pathogenic Bacteria from Chicken and Antimicrobial Drug Sensitivity of the Strain Isolated)

  • 박근식;김기석;남궁선
    • 한국가금학회지
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    • 제7권1호
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    • pp.53-64
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    • 1980
  • A total of 1503 specimens were submitted to the Poultry Disease Diagnostic Service Laboratory during the year 1966 and 1978. The most frequently diagnosed diseases in order of prevalence were avian mycoplasmosis, staphylococcosis, colibacillosis, salmonellosis and pullorum disease, the percentages of the conditions being 24.6%, 20.0%, 18.0%, 12.6% and 6.4%, respectively, The drug resistance of pathogenic mirnoorganisms isolated during the year 1978 from chicken with colicabacillosis, staphylococcosis or salmonellosis were investigated by the use of disc diffusion technique, the results being as follow. 1) Drug resistance of 63 strains of Escherichia coli More than 95% of the strains tested were sensitive to colistin and gentamicin. The percentages of strains sensitive to kanamycin, chloramphenicol, ampicillin and nitrofurantoin were 66.7%, 60.3%, 60.3% and 47.6%, respectively. Majority of the strains were highly resistant to streptomycin and tetracyline. All the strains were resisistant to bacitracin lincomycin, oleandomycin, penicillin and erythromycin. All the strains tested were resistant to more than two among 10 drugs in common use such as penicillin, erythromycin, streptomycin, tetracycline, neomycin, chloramphenicol, kanamycin, ampicillin and gentamicin, and 27 different resistance patterns were noted. The most frequent multiple resistance pattern was PC, EM, SM and TC (11.1%). 2) Drug resistance of 48 strains of Salmonella More than 95% of the strains tested were sensitive to colistin, gentamicin ana ampicillin. The percentages of st rains sensitive to kanamycin, tetracycline, neomycin and nitrofurantoin were 81,3%, 79%, 72.9%, and 68.0% respectively. None of them was sensitive to streptomycin, oleandomycin, erythromycin, lincomycin and bacitracin. All the strains were resistant to more than one among 7 drugs in common use such as streptomycin, erythromycin, neomycin, tetracycline, kanamycin, ampicillin and gentamicin. The most frequent resistance pattern was SM and EM(66.7%). 3) Drug resistance of 54 strains of Staphylococci All the strains tested were sensitive to gentmaicin, kanamycin and cephalothin. Majority of them were highly sensitive to bacitracin, methicillin, nitrofurantoin and chloramphenicol. The Percentages of strains sensitive to streptomycin, ampicillin, lincomycin and tetracycline were 66.7%, 55.6%, 44.4% and 27.8%, respectively. Among them, 51 strains were resistant to more than one among 11 drugs in common use such as tetracycline, lincomycin, ampicillin, penicillin, streptomycin, erythromycin, neomycin, oleandomycin, chloramphenicol, methicillin and bacitracin, and thirty one different resistance patterns were noted.

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Prevalence and Molecular Characterization of Methicillin-Resistant Staphylococcus aureus from Nasal Specimens: Overcoming MRSA with Silver Nanoparticles and Their Applications

  • Aly E. Abo-Amer;Sanaa M. F. Gad El-Rab;Eman M. Halawani;Ameen M. Niaz;Mohammed S. Bamaga
    • Journal of Microbiology and Biotechnology
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    • 제32권12호
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    • pp.1537-1546
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    • 2022
  • Staphylococcus aureus is a cause of high mortality in humans and therefore it is necessary to prevent its transmission and reduce infections. Our goals in this research were to investigate the frequency of methicillin-resistant S. aureus (MRSA) in Taif, Saudi Arabia, and assess the relationship between the phenotypic antimicrobial sensitivity patterns and the genes responsible for resistance. In addition, we examined the antimicrobial efficiency and application of silver nanoparticles (AgNPs) against MRSA isolates. Seventy-two nasal swabs were taken from patients; MRSA was cultivated on Mannitol Salt Agar supplemented with methicillin, and 16S rRNA sequencing was conducted in addition to morphological and biochemical identification. Specific resistance genes such as ermAC, aacA-aphD, tetKM, vatABC and mecA were PCR-amplified and resistance plasmids were also investigated. The MRSA incidence was ~49 % among the 72 S. aureus isolates and all MRSA strains were resistant to oxacillin, penicillin, and cefoxitin. However, vancomycin, linezolid, teicoplanin, mupirocin, and rifampicin were effective against 100% of MRSA strains. About 61% of MRSA strains exhibited multidrug resistance and were resistant to 3-12 antimicrobial medications (MDR). Methicillin resistance gene mecA was presented in all MDR-MRSA strains. Most MDR-MRSA contained a plasmid of > 10 kb. To overcome bacterial resistance, AgNPs were applied and displayed high antimicrobial activity and synergistic effect with penicillin. Our findings may help establish programs to control bacterial spread in communities as AgNPs appeared to exert a synergistic effect with penicillin to control bacterial resistance.

인삼의 생리활성에 관한 연구 (제 3 보)항생물질의 항균활성과 약제내성에 대한 인삼 Saponin의 영향 (Studies of the Physiological Activity of Korean Ginseng (Part 3) The effects of Ginseng Saponin on the Antimicrobial Activity and Drug-resistance of Antibiotics in Bacteria)

  • 전홍기;김선희
    • 한국미생물·생명공학회지
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    • 제10권3호
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    • pp.171-175
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    • 1982
  • 항균 활성이 대체로 상승되었으나 Sarcina maginata의 경우는 약간 감소되었다. $\beta$-lactam 항생 물질인 penicillin G.Na와 ampicillin.Na도 인삼 saponin의 첨가로 항균 활성이 상승되었으나 Serratia 속 세균은 penicillin G.Na의 항균활성에 일정한 효과를 나타내지 않았다. 인삼 saponin 의 첨가에 의한 항생 물질들의 항균 활성의 변화는 Gram양성 세균 및 Gram음성 세균에 대해 일정하지 않은 상승 작용 혹은 길항작용과 같은 비특이성을 나타내었다. 세균의 약제 내성 현상도 인삼 saponin자 항생물질의 투여로 배제될 수 있을 것으로 사료되었다.

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Antimicrobial susceptibility and pathogenic genes of Staphylococcus aureus isolated from the oral cavity of patients with periodontitis

  • Kim, Ga-Yeon;Lee, Chong Heon
    • Journal of Periodontal and Implant Science
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    • 제45권6호
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    • pp.223-228
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    • 2015
  • Purpose: The goal of this study was to characterize the patterns of antimicrobial resistance and virulence genes in samples of Staphylococcus aureus (S. aureus) isolated from periodontitis patients. Methods: From July 2015 to August 2015, oral saliva was collected from a total of 112 patients diagnosed with periodontitis, including 80 outpatients in dental hospitals and 32 patients in dental clinics located in Seoul and Cheonan. The samples were subjected to a susceptibility test to evaluate the prevalence of antimicrobial resistance, and the pathogenic factors and antimicrobial resistance factors in the DNA of S. aureus were analyzed using polymerase chain reaction. Results: A susceptibility test against 15 antimicrobial agents showed that 88% of cultures were resistant to ampicillin, 88% to penicillin, and 2% to oxacillin. Resistance to at least two drugs was observed in 90% of cultures, and the most common pattern of multidrug resistance was to ampicillin and penicillin. Enterotoxins were detected in 65.9% of samples. The cell hemolysin gene hld was detected in 100% of cultures and hla was detected in 97.6% of samples. All strains resistant to penicillin and ampicillin had the blaZ gene. The aph(3')IIIa gene, which encodes an aminoglycoside modifying enzyme, was detected in 46.3% of samples. Conclusions: In the treatment of oral S. aureus infections, it is important to identify the pathogenic genes and the extent of antimicrobial resistance. Furthermore, it is necessary to study patterns of antimicrobial resistance and cross-infection in the context of periodontological specialties in which antimicrobials are frequently used, such as maxillofacial surgery, where the frequency of antimicrobial use for minor procedures such as implant placement is increasing.

폐렴구균에 의한 지역사회 획득 폐렴에서 페니실린 내성률과 내성에 따른 임상경과에 관한 연구 (Prevalence and Clinical Outcome of Penicillin-resistant Pneumococcal Pneumonia)

  • 홍지현;이형석;정승현;김규원;엄광석;이재명;장승훈;김동규;현인규;이명구;박용범;정기석;이영경
    • Tuberculosis and Respiratory Diseases
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    • 제54권3호
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    • pp.295-303
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    • 2003
  • 연구배경 : 국내에서 검출된 폐렴구균의 페니실린 내성률은 약 70%로 알려져 있고, 특히 고도 내성률은 33%로 매우 높은 것으로 알려져 왔다. 내성 균주에 대한 경험적 항생제가 실패할 수 있다는 보고가 있었으나, 내성 여부가 사망률과 무관하다는 반론들도 적지 않았다. 이에 저자들은 폐렴구균에 의한 지역사회획득폐렴에서 페니실린 내성률을 조사하였고, 페니실린에 대한 내성이 치료 실패와 직접적인 연관이 있는지 확인하고자 하였다. 방 법 : 1999년 7월부터 2001년 5월까지 한림대학교 성심병원에 내원한 지역사회 획득 폐렴 환자 중 객담 및 혈액 배양검사를 통해 폐렴구균에 의한 폐렴으로 진단된 42명의 환자를 대상으로 하였다. 배양된 폐렴구균에 대해 E-test를 시행하여 MIC에 따라 감수성, 중등도 내성, 고도 내성으로 분류하여 내성률을 조사하였고, 각 군별로 내성여부에 따른 임상경과를 분석하였다. 결 과 : 폐렴구균에 의한 폐렴으로 진단된 42명의 환자 중 페니실린 감수성 균주($MIC{\leq}0.06{\mu}g/m{\ell}$)는 14예(33.3%), 중등도 내성 균주(MIC $0.1-1{\mu}g/m{\ell}$)는 22예(52.4%), 고도 내성($MIC{\geq}2.0{\mu}g/m{\ell}$) 균주는 6예(14.3%)였다. 경험적 항생제 치료에 대해 감수성 균주에 의한 폐렴 군과 내성 균주에 의한 폐렴 군간에 임상경과는 차이가 없었다. 폐렴구균에 의한 폐렴에서 페니실린에 대한 내성률은 66.7%로 현재까지의 보고와 큰 차이가 없으나 고도내성의 경우 약 33%로 알려진 것에 비해 저자들의 연구에서는 14.3%로 낮게 조사되었다. DRSPTWG의 분류에 따른 내성률은 26.2%에 불과했으며, 고도내성에 해당하는 균주는 없었다. 결 론 : 이와 같은 결과는 폐렴구균에 의한 폐렴의 내성을 정의하는 현재의 기준이 지나치게 낮아 항생제 내성이 높게 나타났기 때문으로 사료되며 기존의 기준에 의한 내성은 경험적 항생제 치료의 예후에 별다른 영향을 주지 못하는 것으로 확인되었다.

유우유방원(乳牛乳房源) Staphylococcus aureus 의 각종 화학요법제(化學療法劑)에 대한 감수성시험(感受性試驗) (Sensitivity of Staphylococcus aureus Isolated From Bovine Udders to Various Chemotherapeutic Agents)

  • 한홍률;정길택
    • 대한수의학회지
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    • 제12권1호
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    • pp.85-89
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    • 1972
  • The minimum inhibitory concentration (MIC) of five chemotherapeutic agents (penicillin, streptomycin, tetracycline, oxytetracycline and furazolidone) was measured for 126 strains of Staphylococcus aureus isolated from the udder of dairy cattle. The results obtained were as follows: 1. The MIC of penicillin, streptomycin, tetracycline, oxytetracycline and furazolidone ranged from 0.03 to 32 ug/ml, 0.06 to 128 ug/ml, 0.06 to 128 ug/ml, 1.0 to 512 ug/ml, and 0.06 to 32 ug/ml, respectively. The most frequent MIC of the above drugs were; penicillin 0.5ug/ml, streptomycin 1.0ug/ml, tetracycline 0.5ug/ml, oxytetracycline 4.0ug/ml, and furazolidone 2.0ug/ml. 2. The number of strains resistant to penicillin. streptomycin, tetracycline and oxytetracycline were 89(70.6), 9(7.1%), 10(7.9%), and 26(20.6%), respectively. Twenty-eight (29.2%) strains showed multiple resistance to more than two antibiotics tested.

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해양미세조류의 무균배양을 위한 항생제의 종류 및 최적 농도 (Antibiotics and Their Optimum Concentration for Axenic Culture of Marine Microalgae)

  • 윤주연;허성범
    • ALGAE
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    • 제22권3호
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    • pp.229-234
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    • 2007
  • This study was to determine the extent of bacteria contamination and resistance to various antibiotics used commonly in microalgal culture. Seven different dose levels of chloramphenicol, dihydrostreptomycin sulphate, neomycin, penicillin G, streptomycin sulphate, penicillin G + streptomycin sulphate, and penicillin G + streptomycin sulphate + chloramphenicol were added to each culture of microalgae. The lethal effects on microalgae and bacteria were the highest in chloramphenicol and the lowest in penicillin G. The axenic culture of bacillariophyceae and dinophyceae was more difficult than that of chlorophyceae and haptophyceae because of their complicate external morphology. The efficient antibiotics and their concentrations for axenic cultures varied with microalgal species. The optimum quantity for antibiotic treatments were 2,000 ppm of dihydrostreptomycin for Chlorella ellipsoidea, neomycin 500 ppm of Isochrysis galbana and Heterosigma ahashiwo, hloramphenicol 500 ppm of Cyclotella didymus, and dihydrostreptomycin sulphate and neomycin 6,000 ppm of Thalassiosira allenii.