85 results about "Antimicrobial susceptibility" patented technology

The present invention relates to moving microorganisms to a surface, where they are grown in the presence and absence of antimicrobials, and by monitoring the growth of the microorganisms over time in the two conditions, their susceptibility to the antimicrobials can be determined. The microorganisms can be moved to the surface through electrophoresis, centrifugation or filtration. When the movement involves electrophoresis, the presence of oxidizing and reducing reagents lowers the voltage at which electrophoretic force can be generated and allows a broader range of means by which the target can be detected. Monitoring can comprise optical detection, and most conveniently includes the detection of individual microorganisms. The microorganisms can be stained in order to give information about their response to antimicrobials.

A diagnostic microbiological testing system and method for microorganism identification (ID) and antimicrobial susceptibility determinations (AST). The system includes multiple-well test panels capable of performing ID and AST testing on the same test panel. Each test panel is inoculated with reagents, broth-suspended organisms, and placed into the instrument system. The instrument system includes a rotating carousel for incubation and indexing, multiple light sources each emitting different wavelength light, precision calorimetric and fluorometric detection, barcode test panel tracking and a control processor for making determinations based on measured test data. One light source includes a plurality of LEDs arranged in a linear array. Each of the LEDs' junction currents are controllable to produce a predetermined illumination profile.

An automated system for identifying in a biological sample microorganisms and their antimicrobial susceptibility (AST). The system provided an automated platform for preparing, from a single biological sample, inoculates for both ID and AST. The system loads a plate for ID testing as samples are being prepared for AST testing. The system tracks the sample and the inoculates from the samples to link the test results to the sample and the patients from whom the sample was obtained.

A system for automated microorganism identification and antibiotic susceptibility testing comprising a reagent cartridge, a reagent stage, a cassette, a cassette, stage, a pipettor assembly, an optical detection system, and a controller is disclosed. The system is designed to dynamically adjust motor idle torque to control heat load and employs a fast focus process for determining the true focus position of an individual microorganism. The system also may quantify the relative abundance of viable microorganisms in a sample using dynamic dilution, and facilitate growth of microorganisms in customized media for rapid, accurate antimicrobial susceptibility testing. Automated quality control test components and methods of their use are also disclosed.

Methods of the invention include the isolation of intact, viable microorganism(s) from positive blood culture (“PBC”) samples for use in downstream analyses such as identification and antimicrobial susceptibility testing (“AST”). The methods involve collecting a portion of the PBC sample, adding a choline-containing solution, lysing the blood cells, isolating the viable microorganism, and performing downstream analysis of the isolated, viable microorganism. The methods can be applied to a variety of gram-positive bacteria, gram-negative bacteria, and/or yeast, and particularly to strains of S. pneumoniae.

The present invention relates generally to the field of health promoting agents, in particular antimicrobial agents and provides antimicrobial peptides and bacterial strains that provide the antimicrobial peptides. In one aspect, the invention provides a biologically pure culture of Lactobacillus acidophilus, strain DPC6026, a sample of which has been deposited at the National Collection of Industrial and Marine Bacteria, Aberdeen, Scotland on 18th Nov. 2005 under the accession number NCIMB 41354, or a derivative or mutant thereof capable of producing from milk or a milk product, peptides having antimicrobial activity.

The present invention relates to a method of detecting the presence of target microorganisms in a biological sample and of simultaneously determining the susceptibility of the microorganisms to antimicrobial agents. The target microbial organisms may be urinary pathogens. The methods include the steps of providing a multicompartment assay device with at least one compartment containing a medium capable of sustaining the growth of total viable microorganisms, at least one compartment containing a medium capable of sustaining the growth of target microorganisms, and at least one compartment containing an antimicrobial susceptibility interpretation medium. A biological sample is placed in each compartment and the presence and antimicrobial susceptibility of the target microorganisms which may be present is determined by analyzing which compartments exhibit microbial growth.

The present invention provides compositions useful as antimicrobial agents which include mammalian hemoglobin, the alpha and beta chains of hemoglobin free of heme, fragments of the alpha and beta chains that result from cyanogen bromide cleavage of the alpha and beta chains, and synthetic peptides derived therefrom. The compositions exert antimicrobial activity against both bacteria and fungi that is comparable to known antimicrobial peptides from human neutrophils, cathepsin G and azurocidin. Sensitive organisms include Gram-negative bacteria such as Escherichia coli and Pseudomonas aeruginosa, Gram-positive bacteria such as Staphylococcus aureus and Streptococcus faecalis, and the fungus Candida albicans. Methods for preparing the compositions also are provided.

The invention relates to a kit for quickly detecting a drug resistance gene of pneumophila pathogenic bacteria, which comprises a gene chip capable of detecting 24 main drug resistance genes of pneumophila pathogenic bacteria and a reaction system for multiple asymmetric PCR reactions. The 24 drug resistance genes are derived from aminoglycosides, quinolones, extended spectrum beta-lactamases (ESBLs), cephalosporins (AmpC), carbapenems and drug resistance genes with vancomycin resistance and methicillin resistance causing membrane permeability transition. The kit can be used for directly detecting drug resistance genes of pneumophila pathogenic bacteria in clinical samples, is simple and quick to operate, does not need culture or drug sensitive tests, gains valuable time for reasonable application of antibiotics to a great extent, and is worthy of clinical popularization and application.

Methods and systems for Resonant Raman spectroscopy are provided. Methods according to certain embodiments include irradiating a sample with a monochromatic light source at a first irradiation intensity and a second irradiation intensity, determining the intensity of one or more of the Resonant Raman scattering and fluorescence scattering at the first irradiation intensity and second irradiation intensity, calculating a rate of change of one or more of the intensity of Resonant Raman scattering and fluorescence in response to the change in irradiation intensity from the first irradiation intensity to the second irradiation intensity and comparing one or more of the rate of change in the intensity of Resonant Raman scattering and the rate of change in the intensity of fluorescence scattering with the rate of change in the irradiation intensity by the monochromatic light source to determine the Resonant Raman response of the sample. Methods also include determining the presence or absence of a microorganism in a sample and correcting for variations associated with measurement instrumentation (e.g., monochromatic light source) and variations associated with the sample (e.g., fluorescence from non-target compounds). Also provided are methods for determining the antimicrobial susceptibility of a microorganism to an antimicrobial agent as well as methods for characterizing a phenotype of an unknown microorganism in a sample. Systems for practicing the subject methods are also provided.

The preparation process of cow mammitis staphylococcus culture fluid and its use belongs to the field of animal epidemic disease diagnosing, preventing and treating technology. The preparation process includes dissolving peptone 10 g, yeast powder 5 g, sodium pyruvate 10 g, glycin 12 g and lithium chloride 5 g in water of 980 ml; regulating pH to 7.3 with sodium hydroxide; sterilizing at 121 deg.c; cooling to 50+/-10 deg.c; adding bacteria-free 1% concentration potassium tellurite water solution in 10 ml and Tween-80 in 7 ml, and preservation at 4 deg. c. The culture fluid may be used in the fast identification of cow mammitis staphylococcus and antibiotic sensitivity test.

The present invention provides devices and methods for determining the presence or absence of pathogens in a biological sample and for the concurrent determination of the antimicrobial susceptibility of pathogens present. The devices and methods of the present invention are able to make the determinations without pre-selection of target bacteria. Instead, all organisms from the sample are applied to the device. In wells where one or more antimicrobial agents are present only pathogens resistant to the antimicrobial agent grow. This allows the user to determine the presence of target pathogens and concurrently determine the resistance patterns of the organisms without the need to subculture the organisms. The present invention also provides methods of performing a business service of performing the determinations described above, and kits containing the devices and descriptions of the methods.

A strain of Lactobacillus salivarius isolated from resected and washed human gastrointestinal tract inhibits a broad range of Gram positive and Gram negative microorganisms and secretes a product having antimicrobial activity into a cell-free supernatant. The activity is produced only by growing cells and is destroyed by proteinase K and pronase E, the inhibitory properties of the strain and its secretory products being maintained in the presence of physiological concentrations of human bile and human gastric juice. The strain exhibits a broad-spectrum of activity against bacteria including Listeria, Staphylococcus, including methocillin resistant St. aureus (MRSA), and Bacillus, but does not inhibit many closely related lactobacilli. An antimicrobial agent is obtained from the strain which has bacteriocin-like properties.

Disclosed herein are methods and compositions for determining the presence or absence of a mechanism of antimicrobial resistance in a sample.

Provided herein are methods, kits and compositions to classify fungi. Methods are provided for classification of fungi according to established phenotypes, for example, antimicrobial susceptibility profiles. More specifically, the invention provides methods for the use of PNA probes in diagnostic applications, which will aid in the direction of appropriate therapy against fungi.

The invention relates to a Paenibacillus polymyxa antimicrobial agent and a preparation method thereof. The antimicrobial agent is prepared by the following steps: Paenibacillus polymyxa CGMCC No.12410 is fermented on a KL medium for 36 hours, and fermented supernatant or a methanol extract product of bacteria is used as the antimicrobial agent. CGMCC No.12410 is cultivated in LB, PDB, Landy, GSC, NB, KL, and TSC under the same conditions, and antimicrobial capability of the fermented supernatant has large difference. In the same medium, the antimicrobial capability of the fermented supernatant is obviously lower than the antimicrobial capability of the methanol extract product of bacteria. An experiment proves that the bacterial strain CGMCC No.12410 is fermented in the KL medium for 36 hours, the methanol extract product of bacteria has wide antimicrobial spectrum, and the methanol extract product of bacteria can inhibit a plurality of pathogenic fungi. At the same time, diseases prevention and inoculation experiments of Botrytis cinerea which are carried out on tomato fruits show that lowest antimicrobial rate of the methanol extract product of bacteria is 88.6%, and antimicrobial effects are good.

The invention provides a compound bactericide with bacteriostatic or bactericidal activity. The composition comprises, by weight, 40% to 50% of linalool, 18% to 25% of terpilenol, 8% to 15% of geraniol, 2% to 4% of beta-cyclocitral, 2.5% to 5% of nerol, 1% to 3% of myrcene, 1% to 3% of ocimene, 3% to 6% of ionone and 5% to 8% of 2H-beta-ionone. Antibacterial and bacteriostatic drug sensitivity tests show that the bactericide artificially prepared on the basis of natural essential oil components has a broad-spectrum inhibition effect on bacteria and fungi. The bactericide has bacteriostatic andbactericidal effects on bacteria (escherichia coli, bacillus subtilis, staphylococcus aureus, staphylococcus epidermidis and the like) and fungi (candida albicans, Schlechospora crassa, trichophytonrubrum, saccharomyces cerevisiae and the like), and particularly has an obvious effect on zoonosis. The bactericide can be applied to development of zoonosis infection and other sterilization products.