1.Immunosuppression by T regulatory cells in cows infected with Staphylococcal superantigen.
Byoung Sun CHANG ; Gregory A BOHACH ; Sang Un LEE ; William C DAVIS ; Lawrence K FOX ; Witold A FERENS ; Keun Seok SEO ; Hye Cheong KOO ; Nam Hoon KWON ; Yong Ho PARK
Journal of Veterinary Science 2005;6(3):247-250
Our recent study has provided that the in vitro SEC-induced proliferation of bovine T cells is preceded by a period of a non-proliferative immunoregulation of T cells that may be associated with cytokine production regulated by type 1 or type 2 T cells. Inversion of CD4+:CD8+ T cell ratio and induction of CD8+T cells with immunoregulatory activity could increase the probability of intracellular survival of Staphylococcus aureus (S. aureus). The increase of activated CD8+(ACT2+ BoCD8+) T cells in cows with mastitis caused by S. aureus may be associated with immune-regulatory function in the bovine mammary gland. The difference and similarity between bovine activated CD8+ T cells (CD8+ CD26+)and well-established human CD4+ CD25+ T regulatory (Tr)cells may help to reveal their unique immune regulatory system in the host infected with S. aureus.
Animals
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Cattle
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Cell Proliferation
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Female
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Lymphocyte Activation/immunology
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Mastitis, Bovine/*immunology/microbiology
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Staphylococcal Infections/immunology/*veterinary
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Staphylococcus/*immunology
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*Superantigens
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T-Lymphocytes/*immunology
2.Capsular polysaccharide typing of domestic mastitis-causing Staphylococcus aureus strains and its potential exploration of bovine mastitis vaccine developmen. I. capsular polysaccharide typing, isolation and purification of the strains.
Hong Ryul HAN ; Son Il PAK ; Seung Won KANG ; Woo Seog JONG ; Cheol Jong YOUN
Journal of Veterinary Science 2000;1(1):53-60
One hundred seven isolates of Staphylococcus aureus from bovine mastitis were investigated for colony morphology in serum-soft agar (SSA), autoagglutination in salt, and capsular serotype. Capsular polysaccharide (CP) was purified and quantified from the extracts of clinical isolates. Overall, 89 isolates (83.2%) were diffuse in the SSA, without any difference in the proportion of diffuse colony between type 5 and type 8 strains. Some strains exhibited compact colonies in the SSA and expressed CP as determined by an enzyme-linked immunosorbent assay, indicating that compact morphology does not exclude encapsulation. The majority of the strains (11/12) showed autoagglutination in the salt aggregation test. The serotype 336 accounted for 46.7% of the isolates followed by serotype 5 (12.1%) and serotype 8 (12.1%). Particularly, twenty-six (24.3%) isolates reacted with two serotypes; 7 for type 8/336 and 19 for type 5/336. Five isolates (4.7%) were nontypeable with monoclonal antibodies specific for CP serotype 5, 8, or 336. The CP concentration in culture supernatants varied with the serotypes, and the total amount of CP produced by cells grown in a liquid medium was much less than that produced by cells grown on a solid medium. The Western blotting indicated that the CP bands of S. aureus serotype 5 and 8 were ranged in the molecular mass of 58-84 kilodalton (kDa), with additional bands in the region of approximately >or= 48 or
3.Invasive potential of biofilm-forming Staphylococci bovine subclinical mastitis isolates.
Manuela OLIVEIRA ; Ricardo BEXIGA ; Sandro Filipe NUNES ; Cristina Lobo VILELA
Journal of Veterinary Science 2011;12(1):95-97
Staphylococcus (S.) aureus is a common infectious agent of bovine chronic mastitis, a disease that is difficult to eradicate. The abilities of Staphylococci to be internalized and form a biofilm can contribute to host immunological defence evasion that subsequently impairs antimicrobial therapy. The invasive capability of six S. aureus field isolates with different biofilm-forming profiles was compared in vitro using a bovine mammary epithelial cell line. This was further confirmed in primary cell cultures using fluorescent rRNA probes against S. aureus. The results suggest that S. aureus invasion levels are not related to biofilm formation.
Animals
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*Biofilms
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Cattle
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Cell Line
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Colony Count, Microbial/veterinary
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Epithelial Cells/microbiology
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Female
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In Situ Hybridization, Fluorescence
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Mastitis, Bovine/*microbiology
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Portugal
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Staphylococcal Infections/*veterinary
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Staphylococcus aureus/classification/genetics/immunology/*physiology
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Virulence Factors/i
4.Occurrence and characterization of livestock-associated methicillin-resistant Staphylococcus aureus in pig industries of northern Thailand.
Prapas PATCHANEE ; Pakpoom TADEE ; Orapun ARJKUMPA ; David LOVE ; Karoon CHANACHAI ; Thomas ALTER ; Soawapak HINJOY ; Prasit THARAVICHITKUL
Journal of Veterinary Science 2014;15(4):529-536
This study was conducted to determine the prevalence of livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) in pigs, farm workers, and the environment in northern Thailand, and to assess LA-MRSA isolate phenotypic characteristics. One hundred and four pig farms were randomly selected from the 21,152 in Chiang Mai and Lamphun provinces in 2012. Nasal and skin swab samples were collected from pigs and farm workers. Environmental swabs (pig stable floor, faucet, and feeder) were also collected. MRSA was identified by conventional bacterial culture technique, with results confirmed by multiplex PCR and multi locus sequence typing (MLST). Herd prevalence of MRSA was 9.61% (10 of 104 farms). Among pigs, workers, and farm environments, prevalence was 0.68% (two of 292 samples), 2.53% (seven of 276 samples), and 1.28% (four of 312 samples), respectively. Thirteen MRSA isolates (seven from workers, four from environmental samples, and two from pigs) were identified as Staphylococcal chromosomal cassette mec IV sequences type 9. Antimicrobial sensitivity tests found 100% of the MRSA isolates resistant to clindamycin, oxytetracycline, and tetracycline, while 100% were susceptible to cloxacillin and vancomycin. All possessed a multidrug-resistant phenotype. This is the first evidence of an LA-MRSA interrelationship among pigs, workers, and the farm environment in Thailand.
*Animal Husbandry
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Animals
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Cross-Sectional Studies
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Genotype
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Humans
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Methicillin-Resistant Staphylococcus aureus/classification/*genetics/*isolation & purification
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Microbial Sensitivity Tests/veterinary
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Molecular Sequence Data
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Multilocus Sequence Typing/veterinary
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Multiplex Polymerase Chain Reaction/veterinary
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Occupational Diseases/*epidemiology/microbiology
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Phylogeny
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Prevalence
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Sequence Analysis, DNA/veterinary
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Staphylococcal Infections/*epidemiology/microbiology
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Swine
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Swine Diseases/*epidemiology/microbiology
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Thailand/epidemiology
5.Antibiotic resistance and molecular characterization of ophthalmic Staphylococcus pseudintermedius isolates from dogs.
Min Hee KANG ; Min Joo CHAE ; Jang Won YOON ; Seung Gon KIM ; So Young LEE ; Jong Hyun YOO ; Hee Myung PARK
Journal of Veterinary Science 2014;15(3):409-415
The prevalence, virulence potential, and antibiotic resistance of ophthalmic Staphylococcus pseudintermedius (SP) isolated from dogs were examined. Sixty-seven Staphylococcus species were isolated from ophthalmic samples and surveyed for species-specific sequences in the Staphylococcus intermedius group (SIG) nuclease gene (SInuc), exfoliative toxin gene for SIG (siet), and antibiotic resistance genes (blaZ and mecA). PCR-restriction fragment length polymorphism analysis of the pta gene was also performed. Fifty isolates were identified as SIG strains, all of which were found to be SP. The blaZ gene was detected in 42 of the 50 SP strains and mecA gene was observed in 18 of the 50 SP strains. The 50 SP strains were most susceptible to amoxicillin/clavulanic acid (94%) and chlorampenicol (70%), and highly resistant to tetracycline (94%) and penicillin (92%). It was also found that 16 (88.9%) mecA-positive SP strains were resistant to oxacillin, tetracycline and penicillin. All mecA-positive SP were resistant to more than four of the eight tested antibiotics and therefore considered SP with multi-drug resistance (MDR). Our results indicate a high prevalence of antibiotic resistance genes in ophthalmic SP along with a close relationship between MDR SP strains and the mecA gene. Based on our findings, judicious administration of antibiotics to companion dogs is necessary.
Animals
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Anti-Bacterial Agents/*therapeutic use
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Dog Diseases/drug therapy/*microbiology
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Dogs
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Drug Resistance, Bacterial
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Drug Resistance, Multiple, Bacterial
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Eye Infections, Bacterial/drug therapy/microbiology/*veterinary
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Microbial Sensitivity Tests/veterinary
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Multiplex Polymerase Chain Reaction
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Staphylococcal Infections/drug therapy/microbiology/*veterinary
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Staphylococcus/*drug effects/isolation & purification
6.Dissimilarity of ccrAB gene sequences between methicillin-resistant Staphylococcus epidermidis and methicillin-resistant Staphylococcus aureus among bovine isolates in Korea.
Young Kyung PARK ; Young Hwan PAIK ; Jang Won YOON ; Lawrence K FOX ; Sun Young HWANG ; Yong Ho PARK
Journal of Veterinary Science 2013;14(3):299-305
The sequences of the ccrAB genes from bovine-, canine- and chicken-originating methicillin-resistant Staphylococcus (S.) epidermidis (MRSE) and bovine methicillin-resistant Staphylococcus (S.) aureus (MRSA) were compared to investigate the frequency of intra-species horizontal transfer of the staphylococcal cassette chromosome mec (SCCmec) complex. Nineteen MRSE strains were isolated from bovine milk, chickens, and dogs, and their genetic characteristics were investigated by multilocus sequence typing and SCCmec typing. Among the animal MRSE strains, the most frequent SCCmec type was type IV, which consisted of the type B mec complex and ccrAB type 2. The ccrA2 and ccrB2 genes were sequenced from the bovine, chicken and canine MRSE strains and compared with those of the bovine MRSA strains. The sequences generally clustered as MRSA and MRSE groups, regardless of the animal source. Additionally, no bovine MRSE sequence was associated with the bovine MRSA groups. Although most of the bovine MRSE and MRSA isolates possessed SCCmec type IV sequences, our results suggest that the intra-species gene transfer of the SCCmec complex between bovine S. aureus and bovine S. epidermidis strains is not a frequent event.
Animals
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Anti-Bacterial Agents/*pharmacology
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Bacterial Proteins/*genetics/metabolism
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Bacterial Typing Techniques/veterinary
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Cattle
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Cattle Diseases/epidemiology/metabolism
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Chickens
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Dog Diseases/epidemiology/metabolism
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Dogs
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*Drug Resistance, Bacterial
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*Gene Transfer, Horizontal
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Methicillin/*pharmacology
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Methicillin-Resistant Staphylococcus aureus/genetics/isolation & purification
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Milk/microbiology
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Multilocus Sequence Typing/veterinary
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Poultry Diseases/epidemiology/metabolism
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Prevalence
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Republic of Korea/epidemiology
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Staphylococcal Infections/epidemiology/microbiology/*veterinary
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Staphylococcus epidermidis/genetics/isolation & purification
7.Unique features of bovine lymphocytes exposed to a staphylococcal enterotoxin.
Yong Ho PARK ; Sang Un LEE ; Witold A FERENS ; Sparrow SAMUELS ; William C DAVIS ; Lawrence K FOX ; Jong Sam AHN ; Keun Seok SEO ; Byoung Sun CHANG ; Sun Young HWANG ; Gregory A BOHACH
Journal of Veterinary Science 2006;7(3):233-239
We previously demonstrated that stimulation of bovine peripheral blood mononuclear cells (PBMCs) with staphylococcal enterotoxin C (SEC), led to an inversion of the CD4(+):CD8(+) T cell ratio and generation of an atypical CD8(+) T cell subpopulation expressing CD26. In the present study, we examined T cell apoptosis and proliferation profiles of PBMC subpopulations in cultures stimulated with SEC. Unlike when stimulated with concanavalin A, nucleic acid synthesis in bovine PBMC cultures stimulated with SEC was low during the first four days but increased greatly on day 5. In contrast, nucleic acid synthesis in human PBMC cultures stimulated with SEC increased continuously. To investigate the mechanism of delayed bovine T cell proliferation, various cell phenotypes were monitored. The inversion of the bovine CD4(+):CD8(+) T cell ratio in PBMC cultures stimulated by SEC was associated with higher proliferation and lower apoptosis of CD8(+) T cells compared to CD4(+) T cells. The mRNA levels for interleukin (IL)-4 and IL-13 were sustained over 4 days but IL-12 mRNA levels dropped to background on day 2. These data suggest that SEC induces a prolonged Th-2- biased microenvironment, and together with the inversion of the bovine CD4(+):CD8(+) T cell ratios in bovine PBMC cultures with SEC, may in part explain the inability of the mammary immune system to establish an effective response to Staphylococcus aureus infections.
Animals
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Apoptosis/drug effects/immunology
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CD4-CD8 Ratio/veterinary
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CD4-Positive T-Lymphocytes/drug effects/*immunology/microbiology
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CD8-Positive T-Lymphocytes/drug effects/*immunology/microbiology
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Cattle
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Concanavalin A/pharmacology
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Cytokines/genetics/immunology
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Enterotoxins/*pharmacology
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Female
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Lymphocyte Activation/drug effects
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Mastitis, Bovine/immunology/*microbiology
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Reverse Transcriptase Polymerase Chain Reaction/veterinary
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Staphylococcal Infections/immunology/microbiology/*veterinary
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Staphylococcus aureus/*immunology
8.A comparative evaluation of methicillin-resistant staphylococci isolated from harness racing-horses, breeding mares and riding-horses in Italy.
Karina MALLARDO ; Sandra NIZZA ; Filomena FIORITO ; Ugo PAGNINI ; Luisa De MARTINO
Asian Pacific Journal of Tropical Biomedicine 2013;3(3):169-173
OBJECTIVETo investigate the prevalence of methicillin-resistant staphylococci (MRS) which is a potencial risk factor of transmission between animals and humans in different types of horses (harness racing-horses, breeding mares and riding-horses) and to compare the antimicrobial resistance of the isolates.
METHODSA total of 191 healthy horses, housed at different locations of the Campania Region (Italy), were included in the study. Nasal swab samples were collected from each nostril of the horses. The mecA gene was detected by a nested PCR technique. Antibiotic susceptibility was tested for each isolate.
RESULTSMRS was isolated from nasal samples of 68/191 (35.6%; 95% CI: 28.9%-42.9%) healthy horses. All isolates were coagulase-negative with the exception of two coagulase-positive MRS strains, identified as Staphylococcus aureus and Staphylococcus pseudintermedius, 2/83 (2.4%; 95% CI: 0.4%-9.2%). Interestingly, both coagulase-positive MRS isolates were from harness racing-horses. These horses also presented a significantly higher positivity for MRS (53.3%; 95% CI: 40.1%-66.1%) than the breeding mares and riding-horses groups. Antibiotic susceptibility testing showed difference between isolates due to different origins except for an almost common high resistance to aminopenicillins, such as ampicillin and amoxicillin.
CONCLUSIONSIt can be concluded that harness racing-horses may act as a significant reservoir of MRS as compared to breeding mares and riding-horses.
Animals ; Anti-Bacterial Agents ; pharmacology ; Coagulase ; Drug Resistance, Multiple, Bacterial ; Female ; Horse Diseases ; epidemiology ; microbiology ; Horses ; Italy ; epidemiology ; Male ; Methicillin-Resistant Staphylococcus aureus ; drug effects ; isolation & purification ; Microbial Sensitivity Tests ; veterinary ; Polymerase Chain Reaction ; veterinary ; Prevalence ; Staphylococcal Infections ; epidemiology ; microbiology ; veterinary
9.In vitro susceptibility of Staphylococcus aureus strains isolated from cows with subclinical mastitis to different antimicrobial agents.
Ayman El BEHIRY ; Gerd SCHLENKER ; Istvan SZABO ; Uwe ROESLER
Journal of Veterinary Science 2012;13(2):153-161
Sensitivity to commercial teat dips (nonoxinol-9 iodine complex and chlorhexidine digluconate) of 56 Staphylococcus (S.) aureus strains isolated from quarter milk samples of various German dairy herds treated with different teat dipping schemes was investigated in this study. The minimum inhibitory concentration was determined using a broth macrodilution method according to the German Veterinary Association guidelines. The main objective of the current study was to induce in vitro resistance induction of S. aureus to chemical disinfectants. Ten different strains were repeatedly passed ten times in growth media with sub-lethal concentrations of disinfectants. Nine strains showed a significant reduction in susceptibility to the nonoxinol-9 iodine complex but only one strain developed resistance to chlorhexidine digluconate. Stability of the acquired resistance was observed in all S. aureus strains adapted to the nonoxinol-9 iodine complex and chlorhexidine digluconate. In contrast, simultaneous resistance to different antibiotics was not observed in any of the ten investigated S. aureus strains. However, the isolates exhibited a high degree of resistance to penicillin G. Based on these results, resistance of S. aureus to chemical disinfectants may be more likely to develop if the chemicals are used at concentrations lower than that required for an optimal biocidal effect.
Animals
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Anti-Bacterial Agents/pharmacology
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Cattle
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Chlorhexidine/*pharmacology
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Disinfectants/pharmacology
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Dose-Response Relationship, Drug
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Drug Resistance, Bacterial
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Female
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Germany/epidemiology
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Iodine/chemistry/*pharmacology
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Mastitis, Bovine/epidemiology/*microbiology
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Nonoxynol/*pharmacology
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Staphylococcal Infections/epidemiology/microbiology/*veterinary
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Staphylococcus aureus/classification/*drug effects
10.Comparative studies on pheno- and genotypic properties of Staphylococcus aureus isolated from bovine subclinical mastitis in central Java in Indonesia and Hesse in Germany.
Siti Isrina Oktavia SALASIA ; Zaini KHUSNAN ; Christoph LAMMLER ; Michael ZSCHOCK
Journal of Veterinary Science 2004;5(2):103-109
In the present study, 35 Staphylococcal strain isolated from milk samples of 16 cows from eight farms of three different geographic locations in Central Java, Indonesia, and from milk samples of 19 cows from 19 farms of different geographic locations in Hesse, Germany, were compared pheno- and genotypically. On the basis of cultural and biochemical properties as well as by amplification of the 23S rRNA specific to Staphylococcus aureus, all isolates could be identified as S. aureus. In addition, all S. aureus isolates harboured the genes clfA and coa encoding staphylococcal clumping factor and coagulase, and the gene segments encoding the immunoglobulin G binding region and the X-region of protein A gene spa. By PCR amplification, the genes seb, seg, seh, and sei was observed for the S. aureus cultures isolated in Central Java, Indonesia and the genes sec, sed, seg, seh, sei, sej and tst for the S. aureus cultures isolated in Hesse, Germany. None of the S. aureus of both origins harboured the genes sea, see, eta and etb. All isolates were additionally positive for the genes nuc, fnbA, hla, and set1. The gene hlb was found for 6 cultures from Central Java, Indonesia and 16 cultures from Hesse, Germany. However, the gene fnbB and the gene segments cnaA and cnaB were not present among the strains isolated in Central Java, Indonesia and rare among the strains isolated in Hesse, Germany. It was of interest that most of the S. aureus isolated in Central Java, Indonesia harboured the gene cap5 and most of the strains isolated in Hesse, Germany the gene cap8. The phenotypic and genotypic results of the present study might help to understand the distribution of prevalent S. aureus clones among bovine mastitis isolates of both countries and might help to control S. aureus infections in dairy herds.
Animals
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Bacterial Typing Techniques
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Cattle
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Female
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Genes, Bacterial
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Genotype
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Germany
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Indonesia
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Mastitis, Bovine/*microbiology
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Phenotype
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Polymerase Chain Reaction
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RNA, Bacterial/genetics
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RNA, Ribosomal, 23S/genetics
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Staphylococcal Infections/microbiology/*veterinary
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Staphylococcus aureus/classification/*genetics/isolation&purification