78 results about "Bacterial antigen" patented technology

The present invention describes a method for treating, removing or preventing a bacterial infection, which method comprises administering to a human suffering, suspected of suffering or at risk of suffering from Staphylococcus aureus (S. aureus) infection, a Streptococcus infection, Escherichia coli (E. coli) infection, Pseudomonas aeruginosa (P. aeruginosa) infection, Acinetobacter baumannii (A. baumannii) infection, Enterococcus faecium (E. faecium) infection and / or Clostridium difficile (C. difficile) infection, an effective amount of human polyclonal antibodies affinity purified from a human blood sample with an antigenic preparation comprising cellular and / or secreted antigen(s) from bacterial cells selected from S. aureus, a Streptococcus, E. coli, P. aeruginosa, A. baumannii, E. faecium, C. difficile or a combination thereof, and optionally, wherein said affinity purified human polyclonal antibodies are purified (e.g., as made more concentrated as compared to the starting or unpurified material) relative to the same human polyclonal antibodies in the unpurified or non-affinity-purified human blood sample, e.g., intravenous immunoglobulin (IVIG) sample, and / or also optionally, wherein said affinity purified human polyclonal antibodies are specific for the bacterial antigens used in the affinity purification, and / or further optionally wherein the affinity purified human polyclonal antibodies are substantially free of human antibodies that specifically bind to non-bacterial antigens in the human blood sample. Pharmaceutical compositions for treating bacterial infections, comprising an effective amount of human polyclonal antibodies affinity purified from a human blood sample with an antigenic preparation comprising cellular and / or secreted antigen(s) from S. aureus, Streptococcus, E. coli, P. aeruginosa, A. baumannii, E. faecium, C. difficile or a combination thereof, are also provided.

Vaccines comprising an S. aureus alpha-toxin antigen and a pharmaceutically acceptable carrier are provided, and are useful for treating and preventing infections. The S. aureus alpha-toxin antigen may contain at least two alterations that reduce its toxicity and / or may be conjugated to or co-administered with another bacterial antigen. The vaccines may comprise one or more other bacterial antigens. Antibody compositions comprising antibodies to alpha-toxin and optionally one or more other bacterial antigens also are provided, and are useful for treating and preventing infections.

PCT No. PCT / SE96 / 00727 Sec. 371 Date Jul. 12, 1996 Sec. 102(e) Date Jul. 12, 1996 PCT Filed Jun. 3, 1996 PCT Pub. No. WO96 / 38475 PCT Pub. Date Dec. 5, 1996The present invention relates to recombinant polypeptides which constitute Helicobacter pylori surface-exposed antigens with an approximate molecular weight of 29 kDa. The invention furthermore provides nucleic acid molecules coding for the said polypeptides, as well as vectors and host cells comprising such nucleic acid molecules. The said recombinant polypeptides are useful for the diagnosis of H. pylori infections and for the manufacture of vaccine compositions which will elicit a protective immune response against such infections, said vaccine compositions being suitable for both therapeutic and prophylactic use.

A novel method of immunization, which can be used either prophylactically or therapeutically, is described. The method comprises coating of antigen presenting cells with a peptide and administering the peptide-coated cells to a mammalian subject to provoke an immune response. Useful peptides include peptides derived from viral or bacterial antigens or mutant oncogene or tumor suppressor gene products. Immunogens, constituted by the peptide-coated cells, are also described.

This invention relates generally to in vitro methods for inducing or enhancing expression of enteric bacterial antigens and / or virulence factors thereby producing antigenically enhanced enteric bacteria, to methods for using antigenically enhanced enteric bacteria and to vaccines comprising antigenically enhanced enteric bacteria. A Campylobacter bacterium having enhanced antigenic property is disclosed. A culture medium useful for culturing the Campylobacteria comprises 0.05% to 3% bile or 0.025% to 0.6% of one or more bile acids or salts. In addition a divalent cation chelator can also be included in the culture medium. The bacteria culture is in a growth phase at early log phase and between early log phase and stationary phase. The enhanced antigenic property is a higher level of an immunogenic antigen when compared to the antigenic property of the same bacteria grown on brain heart infusion broth. Also, antibodies to Campylobacter bacteria or Campylobacteria in samples are detected by immunoassays.

An antigen-presenting system (APS) comprising one or more enterobacterial antigens in combination with a papaya mosaic virus (PapMV) or a virus like particle (VLP) derived from papaya mosaic virus isprovided. The PapMV or VLP included in the APS is capable of potentiating an immune response against said one or more enterobacterial antigens. The APS can be used, for example, as a vaccine against enterobacterial disease, such as typhoid fever. The one or more antigens comprised by the APS can be conjugated to a coat protein of the PapMV or PapMV VLP, or they may be non-conjugated (i.e. separatefrom the PapMV or PapMV VLP), or the APS can comprise both conjugated and non-conjugated antigens. Conjugation can be, for example, by genetic fusion with the coat protein, or binding via covalent, non-covalent or affinity means.

The invention provides methods for screening for the presence of a clinically relevant amount of bacteria in donor blood or a blood product from a donor mammal, particularly blood or a blood product that will be transferred from the donor mammal to a recipient mammal. The method comprises contacting a sample of the donor blood or a blood product with a set of binding agents that comprises binding agents that specifically bind to Gram-negative bacterial antigen and / or binding agents that specifically bind to Gram-positive bacterial antigen, and determining binding of the set of binding agents to the sample, wherein binding indicates the presence of a clinically relevant amount of Gram-positive bacteria and / or Gram-negative bacteria in the donor blood or blood product and no binding indicates the absence of a clinically relevant amount of Gram-positive bacteria and / or Gram-negative bacteria in the donor blood or blood product.The invention further provides methods and kits for screening for the presence of a clinically relevant amount of Gram-positive bacteria, Gram-negative bacteria, or both Gram-positive and Gram-negative bacteria in a donor tissue by screening the fluid in which the donor tissue is stored.

The invention relates to both a sensitive method for the capture and detection of low-abundance Borrelia burgdorferi (Bb) bacterial antigens allowing for the diagnosis of Lyme Disease using standard immunoassays. Furthermore, this invention allows the antigen to be identified in a sample of urine, serum, or other biological fluids isolated from humans and animals. The invention provides a method to capture, concentrate, separate and specifically quantify the abundance of Bb antigens using immunoassays. The detection of Bb Outer Surface Protein A is presented as an example of the disclosed invention. High sensitivity levels, low cost and easily collected biofluids allow this technology to reach patients in clinics as well as POC applications for the early detection of Lyme disease prior to seroconversion. A kit containing necessary reagents and the method for diagnosis, monitoring or assessing lyme disease using an immunoassay such as an ELISA, western blot or RPPMA is disclosed.

A pharmaceutical composition includes a purified antibody and a pharmaceutically acceptable carrier. The antibody can be a monoclonal antibody having both an antigen-binding portion that binds at least one bacterial antigen and a constant region that does not bind staphylococcal protein A.

Herein, it is shown that strong specific anti-methanogen avian antibodies can be produced when chickens are immunized with an optimal dose of methane producing bacterial antigen (methanogen) formulated with an appropriate adjuvant. The antibodies can in turn be used to reduce methane gas production from an animal by administering an effective amount of the anti-methanogen antibodies to the animal, thereby reducing methane gas evolved by the animal compared to an untreated or mock treated control animal of similar age and condition.

The inventive subject matter relates to a competitive method for estimating the concentration in a sample of a Bacillus anthracis protein or antibody thereof selected from the group consisting of protective antigen (PA), lethal factor (LF) and edema factor (EF). The method may employ the use of Fluorescence Polarization, FLT or FRET. The competitive methods are capable of detecting a target protein within 5 minutes within the range of 0.1 to 10.0 nM. The methods provide for the rapid detection and quantitation of bacteria, bacterial antigen or antibody in culture media or broth of growing cultures of bacteria, including B. anthracis by fluorescent methods.

Modified bacterial surface layer (S-layer) proteins are disclosed where the modification is the insertion, at an internal location, of a heterologous polypeptide, or polypeptide of interest. The polypeptide is a binding or target protein, such as an antigen or antibody, or part thereof, in particular a bacterial antigen (e.g. from Clostridium tetani such as TTFC). The modified surface layer protein can then be expressed on the surface of the bacterial cell and used in a vaccine. Also disclosed are bacteria which have been modified to express a heterologous surface layer protein, but which do not as a wild-type possess an S-layer (such as L. casei), and modified bacteria which express only a modified surface layer protein (and not the wild-type S-layer protein). The wild type S-layer is completely replaced with the modified version where the polynucleotide encoding the modified version is integrated into the bacterial genome. The modified S-proteins can form crystalline arrays, sheets or layers that can be used to bind functional molecules (e.g. receptors) to solid surfaces (Au, silicon wafers) in biosensors.

The present invention relates to bacteriophages for use in the treatment or prophylaxis of bacterial infections, especially mucosal bacterial infections such as Heliobacter pylori infections, in particular, it relates to modified filamentous bacteriophages, e.g. M13 phages, for such use, which bacteriophages present at the surface a recombinant protein comprising (i) a first component derived from a bacteriophage surface protein; and (ii) a second component comprising variable region sequences of an antibody to provide a bacterial antigen binding site, said second component rendering said bacteriophage capable of binding to and thereby inhibiting growth of bacterial cells involved in the etiology of said infection.

The invention belongs to the technical field of bacterial antigen, and discloses a pseudomonas aeruginosa vaccine recombinant protein SBP, and a preparation method and applications thereof. The nucleotide sequence is SEQ ID NO:1; the amino acid sequence is SEQ ID NO:2; a recombinant expression carrier contains a nucleotide sequence SEQ ID NO:1. According to the preparation method, pGEX-6p-1carrieris adopted in construction of a recombinant expression plasmid for expression of recombinant protein SBP; pGEX is an expression fusion protein carrier constructed by Smith and Johnson in 1987, and the main characteristic is that the carrier is grafted with glutathione-S-transferase (GST) with a molecular weight of 26kDa; the expressed fusion protein contains a GST label; and the label is a protein purification label. Compared with other fusion carriers, the pGEX carrier is capable of maintaining the space conformation and the immunogenicity of the purified protein as far as possible.

The present invention relates to recombinant polypeptides which constitute Helicobacter pylori surface-exposed antigens with an approximate molecular weight of 29 kDa. The invention furthermore provides nucleic acid molecules coding for the said polypeptides, as well as vectors and host cells comprising such nucleic acid molecules. The said recombinant polypeptides are useful for the diagnosis of H. pylori infections and for the manufacture of vaccine compositions which will elicit a protective immune response against such infections, said vaccine compositions being suitable for both therapeutic and prophylactic use.