摘要:
A substantially pure capsular exopolysaccharide adhesin of coagulaso-negative staphylococcal strains, and a general method to prepare such adhesins, are described. Vaccines composed of such adhesins, and uses of such adhesins to produce polyclonal and mono-clonal antibodies against such adhesins, are also disclosed. The adhesins are useful in coating polymeric medical materials to prevent colonization by coagulase-negative staphylococcal strains, and as a probe in selecting desirable polymeric medical materials. Such adhesin antibodies are useful in vivo to prevent infection by noso-comial coagulase-negative staphylococcal strains, in assays for the detection of such bacteria, in assays for the estimation of such adhesins in complex mixtures, and as an affinity chromatography matrix.
摘要:
An antigenic composition is derived from surface extracted protein of cell wall surfaces and the culture supernatant extract of Staphylococci. The strain is highly virulent and &bgr; hemolytic on blood agar plate. They are mixed and purified by ion exchange and gel filtration column chromatography. This preparation method can be used in all Gram-positive bacilli. The antigens, having molecular weight of about 10,000-70,000 are certain kinds of glycoprotein comprising proteins (ca. 10-20%) and carbohydrates (ca. 75-90%). They are extracted from the cells with the use of a hypertonic buffer solution of pH 6.5-8.5 at a temperature below the denaturing point of the antigenic protein, and are salted out with ammonium sulfate (ca. 65-85%). The culture supernatant is extracted in the same way by salting out with ammonium sulfate (ca. 65-85%). The antigen fraction from both cell wall and culture supernatant is obtained in such an operation. The antigen can be used as a preparation antigen to Staphylococcus antigen. Namely, the antibody obtained from mammal and avian immunized by this antigen can be used to treat the above-described infections. The composition containing the antibody provides a preventive effect.
摘要:
Multicomponent vaccines are provided which aid in the prevention and treatment of staphylococcal infections and which include certain selected combinations of bacterial binding proteins or fragments thereof, or antibodies to those proteins or fragments. By careful selection of the proteins, fragments, or antibodies, a vaccine is provided that imparts protection against a broad spectrum of Staphylococcus bacterial strains and against proteins that are expressed at different stages of the logarithmic growth curve. In one embodiment of the invention, a composition is provided that includes at least a collagen binding protein or peptide (or an appropriate site directed mutated sequence thereof) such as CNA, or a protein or fragment with sufficiently high homology thereto, in combination with a fibrinogen binding protein, preferably Clumping factor A (“ClfA”) or Clumping factor B (“ClfB”), or a useful fragment thereof or a protein or fragment with sufficiently high homology thereto. The vaccines and products of the present invention are advantageous in that they respond to the urgent need of the medical community for a substitute for small molecule antibiotics, which are rapidly losing effectiveness and provide effective combinations of the large number of known bacterial surface adhesins which can impart effective protection against a broad spectrum of bacterial infections.
摘要:
This invention provides peptides which inhibit agr transcription in S. aureus and thereby block the expression of virulence factors in S. aureus, pharmaceutical compositions comprising these peptides, as well as methods for treating or preventing an infection or disease caused by S. aureus using the peptides of the present invention.
摘要:
spsA polypeptides and DNA (RNA) encoding such spsA and a procedure for producing such polypeptides by recombinant techniques is disclosed. Also disclosed are methods for utilizing such spsA for the treatment of infection, particularly bacterial infections. Antagonists against such spsA and their use as a therapeutic to treat infections, particularly bacterial infections are also disclosed. Also disclosed are diagnostic assays for detecting diseases related to the presence of spsA nucleic acid sequences and the polypeptides in a host. Also disclosed are diagnostic assays for detecting polynucleotides encoding spsA and for detecting the polypeptide in a host.
摘要:
The invention provides antigenic compositions for the vaccination of an animal against bovine mastitis caused by infection with Staphylococcus aureus. The invention also provides methods for stimulating an animal's immune system to respond to antigens derived from selected strains of Staphylococcus aureus by administering the antigenic compositions of the invention to the animal.
摘要:
A negatively-charged S. aureus antigen contains &bgr;-hexosamine as a major carbohydrate component. S. aureus strains that carry the antigen account for nearly all of the clinically significant strains of S. aureus that are not Type 5 or Type 8 strains. The antigen can be used in combination with S. aureus Type 5 polysaccharide antigen and S. aureus Type 8 polysaccharide antigen to provide nearly 100% coverage of S. aureus infection. The antigen and antibodies to the antigen are useful in kits and assays for diagnosing S. aureus infection. A whole cell vaccine of cells that contain the antigen is particularly useful in the treatment of mastitis.
摘要:
spsA polypeptides and DNA (RNA) encoding such spsA and a procedure for producing such polypeptides by recombinant techniques is disclosed. Also disclosed are methods for utilizing such spsA for the treatment of infection, particularly bacterial infections. Antagonists against such spsA and their use as a therapeutic to treat infections, particularly bacterial infections are also disclosed. Also disclosed are diagnostic assays for detecting diseases related to the presence of spsA nucleic acid sequences and the polypeptides in a host. Also disclosed are diagnostic assays for detecting polynucleotides encoding spsA and for detecting the polypeptide in a host.
摘要:
A process is disclosed for obtaining a C-polysaccharide cell wall antigen containing not more than about 10% protein from Streptococcus pneumoniae bacteria. The antigen thus obtained is conjugated to a spacer molecule, and the free end of the latter is then conjugated to a chromatographic affinity column. The column is then utilized to purify raw antibodies to S. pneumonia bacteria, thereby producing antigen-specific antibodies. A portion of such antibodies is conjugated to a labeling agent which displays a visible color change upon reaction of the antibodies with their antigenic binding partner and embedded in a first zone of an immunochromatographic assay device. Another portion of such antibodies is bound to the reaction zone of the device which has a view window. When a liquid sample, such as patient urine, cerebrospinal fluid or blood is applied to the first zone, the conjugate of antibodies and labeling agent and the sample move along a flow strip of bibulous material to the reaction zone wherein, if the sample contains S. pneumoniae or its cell wall antigen, a sandwich is formed among the labeled conjugate, the antigen and the bound antibodies and a color change is observed. The immunochromatographic assay thus performed is completed within about 15 minutes. This assay affords a basis for rapid and reliable diagnosis of various pathogenic states caused by S. pneumoniae including pneumonia, bronchitis, otitis media, sinusitis, meningitis, and secondary disease states that commonly occur when primary pneumonic infection caused by this bacterium persists undiminished over a time period of 3-5 days.
摘要:
Disclosed are two genes, termed “yphC” and “yqjK,” found in Streptococcus pneumoniae, which are essential for survival for a wide range of bacteria. These genes and the essential polypeptides that they encode, as well as homologs and orthologs thereof, can be used to identify antibacterial agents for treating a broad spectrum of bacterial infections.