57 results about "Lawsonia intracellularis" patented technology

The present invention relates to Lawsonia intracellularis vaccines and methods for protecting against and diagnosing L. intracellularis infection. The products and processes of the invention are attainable, in part, as the result of an improved method for cultivating large scale supplies of L. intracellularis, including both a novel isolate of L. intracellularis of European origin and a method of preparing a lyophilized product containing the attenuated European isolate as vaccine product.

The present invention relates i.a. to nucleic acid sequences encoding novel Lawsonia intracellularis proteins. It furthermore relates to DNA fragments, recombinant DNA molecules and live recombinant carriers comprising these sequences. Also it relates to host cells comprising such nucleic acid sequences, DNA fragments, recombinant DNA molecules and live recombinant carriers. Moreover, the invention relates to proteins encoded by these nucleotide sequences. The invention also relates to vaccines for combating Lawsonia intracellularis infections and methods for the preparation thereof. Finally the invention relates to diagnostic tests for the detection of Lawsonia intracellularis DNA, the detection of Lawsonia intracellularis antigens and of antibodies against Lawsonia intracellularis.

The present invention relates generally to therapeutic compositions for the treatment and/or prophylaxis of intestinal disease conditions in animals and birds caused or exacerbated by Lawsonia intracellularis or similar or otherwise related microorganism. The present invention also contemplates methods for the treatment and/or prophylaxis of such intestinal disease conditions and to diagnostic agents and procedures for detecting Lawsonia intracellularis or similar or otherwise related microorganism.

The present invention provides nucleic acid and amino acid sequences useful as the immunogenic portion of vaccines or immunogenic compositions effective for lessening the severity of the clinical symptoms associated with Lawsonia intracellularis infection or conferring protective immunity to an animal susceptible to such infection. Preferred amino acid sequences are selected from the group consisting of 1) a polypeptide comprising a sequence selected from the group consisting of SEQ ID Nos.: 1-455, SEQ ID No 466, or the polypeptide encoded by SEQ ID No: 456, SEQ ID No: 457 or SEQ ID No: 466; 2) any polypeptide that has at least 85% sequence homology, more preferably at least about 90% sequence homology, still more preferably at least about 95% sequence homology, even more preferably at least about 97% sequence homology, still even more preferably at least about 98% sequence homology, and even more preferably at least about 99% sequence homology to the polypeptide of 1); 3) any immunogenic portion of the polypeptides of 1) and/or 2) 4) the immunogenic portion of 3), comprising at least 300, 290, 280, 270, 260, 250, 240, 230, 220, 210, 200, 190, 180, 170, 160, 150, 140, 130, 120, 110, 100, 90, 80, 70, 60, 50, 45, 40, 35, 30, 25, 20, 18, 15, 13, 10, or most preferably 9 contiguous amino acids included in the sequences of SEQ ID No: 1-455, SEQ ID No: 456, or the amino acid sequence encoded by SEQ ID No: 457 or SEQ ID No: 466; and/or 5) a polypeptide that is encoded by a DNA that codes for a peptide comprising the sequence of SEQ ID No: 1-455 or SEQ ID No: 466. Thus, the nucleic acid sequences encoding such proteins, or the proteins themselves are included in vaccine compositions, together with veterinary-acceptable carrier and administered to an animal in need thereof.

A proliferative ileitis vaccine comprising tissue culture grown Lawsonia intracellularis and methods of making said vaccines. Proliferative ileitis vaccines described include those containing whole L. intracellularis, extracts of L. intracellularis, protective immunogenic subunits of L. intracellularis, recombinant immunogens of L. intracellularis and naked DNA of L. intracellularis. The vaccines of this invention may be inactivated or modified live and contain adjuvants and/or stabilizers. The vaccines of this invention may be in a liquid or lyophilized form. Also disclosed are monoclonal antibodies which neutralize the growth of L. intracellularis and which may be used for diagnosing proliferative ileitis as well as for quantitating antigen during vaccine production.

The present invention relates generally to therapeutic compositions for the treatment and/or prophylaxis of intestinal disease conditions in animals and birds caused or exacerbated by Lawsonia intracellularis or similar or otherwise related microorganism. In particular, the present invention provides a novel gene derived from Lawsonia intracellularis which encodes an immunogenic OmpH peptide, polypeptide or protein that is particularly useful as an antigen in vaccine preparation for conferring humoral immunity against Lawsonia intracellularis and related pathogens in animal hosts. The present invention is also directed to methods for the treatment and/or prophylaxis of such intestinal disease conditions and to diagnostic agents and procedures for detecting Lawsonia intracellularis or similar or otherwise related microorganisms.

The present invention relates inter alia to the use of a combination of a vaccine against Lawsonia intracellularis and an anti-Lawsonia antibiotic for the prevention or reduction of early, preferably fulminant Lawsonia intracellularis infections. The present invention relates particularly to the use of a live Lawsonia intracellularis vaccine in conjunction with an antibiotic that is effective against Lawsonia intracellularis, for the avoidance or reduction of early Lawsonia intracellularis infections in animals.

The present invention provides nucleic acid and amino acid sequences useful as the immunogenic portion of vaccines or immunogenic compositions effective for lessening the severity of the clinical symptoms associated with Lawsonia intracellularis infection or conferring protective immunity to an animal susceptible to such infection. Preferred amino acid sequences include at least 9 contiguous amino acids from SEQ ID NOS 1 (IDFKAKGVWDFNNFE), 3 (IDFKAKGVWDFNNFEWQQSSFMKG), or 7 (MKLGYKISAGFAIGMIMVVLM). Thus, the nucleic acid sequences encoding such proteins, or the proteins themselves are included in vaccine compositions, together with veterinary-acceptable carrier and administered to an animal in need thereof.

The invention relates to a porcine lawsonia intracellularis immunoperoxidase monolayer assay (IPMA) antigen detection method. The rabbit anti-lawsonia intracellularis SodC protein polyclonal antibodyis prepared by taking purified recombinant SodC protein as immunogen, and the titer and the reactogenicity are detected. The lawsonia intracellularis IPMA antigen detection method is established by taking lawsonia intracellularis positive bacteria as a coating antigen and taking a prepared polyclonal antibody as a primary antibody. The method has good specificity, sensitivity and repeatability, expensive instruments such as a fluorescence inversion microscope, a microplate reader and a PCR instrument are not needed, operation is easy and convenient, judgment is more visual, the dyed microporous plate can be stored for a long time, the method is suitable for screening of a large number of samples, and a new means is provided for positioning and detection of lawsonia intracellularis in infected cells.

The invention discloses an enzyme-linked immunosorbent assay (ELISA) test kit for testing lawsonia intracellularis (LI) of pigs. The ELISA test kit for testing the LI of the pigs comprises a solid phase carrier and an antigen enveloped in the solid phase carrier, wherein the antigen is LsaA recombinant protein, and the amino acid sequence of the LsaA recombinant protein is as shown in SEQ ID No. 1. The kit has the characteristics of being higher in sensitivity, high in specificity, good in stability, and the like, and has the advantages of convenient use, simple operation, short detection timeand low use cost; the kit can be used for carrying out serological investigation, antibody detection, vaccine immune effect evaluation and the like on the LI infection condition of the pigs, and is suitable for large-scale popularization and use.

The invention discloses a separation and culture method for Lawsonia intracellularis. The method comprises the following steps: preparation of Lawsonia intracellularis isolation; subculture of McCoy cells; bacterium inoculation and culture; generation transferring and cryopreservation of Lawsonia intracellularis; and identification on the Lawsonia intracellularis. According to the method, the McCoy cells are used as host cells and are applied to the separation and culture of the Lawsonia intracellularis, the vacancy that the Lawsonia intracellularis is not successfully separated and cultured from a body of a pig yet domestically is filled up, and a foundation is settled for research and development of attenuated vaccines of the Lawsonia intracellularis and research on a pathogenesis mechanism.

The present invention pertains to a vaccine comprising in combination killed whole cell Lawsonia intracellularis bacteria and porcine circo virus 2 (PCV2) ORF2 protein for use in protecting a pig against an infection with Lawsonia intracellularis and PCV2 by an intradermal administration of the vaccine. The invention also pertains to a method to protect a swine against an infection with Lawsonia intracellularis bacteria and PCV2.

The invention discloses a method for establishing a PK-PD synchronous model of tilmicosin to Lawsonia intracellularis of pigs. The method comprises the following steps: drawing a growth curve of Lawsonia intracellularis in IPEC-J2 cells; determining intracellular and extracellular minimum inhibitory concentrations, anti-mutation concentrations and antibacterial post-effects of tilmicosin on lawsonia intracellular and extracellular of pigs, and drawing in-vitro and semi-in-vivo intracellular sterilization curves; selecting proper PK-PD parameters according to a measured intracellular sterilization curve in a lawsonia intracellularis half body, fitting data, establishing a PK-PD synchronous model of tilmicosin to lawsonia intracellularis, and formulating a reasonable dosing scheme. Accordingto the invention, an administration scheme of tilmicosin to Lawsonia intracellularis can be formulated, stable medication data support is provided for scientific culture, and clinical medication is scientifically guided; the drug resistance of the lawsonia intracellularis to the tilmicosin is effectively relieved, the effectiveness of the tilmicosin is protected and maintained, and a guide is provided for researching the PK-PD synchronous model of the antibacterial drug to the intracellular bacteria.

A method for large scale cultivation and attenuation of L. intracellularis bacteria by inoculating cells with L. intracellularis bacteria to infect the cells, incubating the infected cells in a reduced oxygen concentration and maintaining the infected cells in suspension. Anti-L. intracellularis vaccines are prepared from cultures grown in suspension. Diagnostic agents are also disclosed.

This invention relates to methods for cultivating Lawsonia intracellularis. In particular, the present invention provides improved methods for cultivating Lawsonia intracellularis by employing reducing agents other than molecular hydrogen; or alternatively, by employing a combination of one or more reducing agents with molecular hydrogen. This invention also relates to vaccines and diagnostic reagents prepared from Lawsonia intracellularis cultivated by employing the methods disclosed herein.