摘要:
A bacterial cell (preferably a gram-negative, enteric bacterium such as V. cholerae) the chromosome of which which contains a DNA sequence encoding a heterologous antigen, which sequence is functionally linked to an iron-regulated promoter such as the irgA promoter of V. cholerae.
摘要:
The invention relates to vaccine compositions having a carrier protein and an antigen of interest entrapped in a complex, methods of making such vaccines, and methods of vaccine administration.
摘要:
A vector capable of integrating into the chromosome of Salmonella including a first DNA sequence encoding a heterologous protein, a second DNA sequence encoding a marker, and a third DNA sequence encoding a phoP regulatory region regulated gene product necessary for virulence, the third DNA sequence being mutationally inactivated
摘要:
A genetic system termed in vivo expression technology was devised that positively selects for microbial genes that are specifically induced when microbes infect their host. The method of this invention comprises complementing the growth of an auxotrophic or antibiotic sensitive microorganism by integrating an expression vector by way of homologous recombination into the auxotrophic or antibiotic sensitive microorganism's chromosome and inducing the expression of a synthetic operon which encodes transcripts, the expression of which are easily monitored both in vitro and in vivo.
摘要:
The invention features a general system for the identification of essential genes in organisms. This system is applicable to the discovery of novel target genes for antimicrobial compounds, as well as to the discovery of genes that enhance cell growth or viability.
摘要:
A vector capable of integrating into the chromosome of Salmonella including a first DNA sequence encoding a heterologous protein, a second DNA sequence encoding a marker, and a third DNA sequence encoding a phoP regulatory region regulated gene product necessary for virulence, the third DNA sequence being mutationally inactivated.
摘要:
The invention features a nontoxigenic genetically stable mutant strain of V. cholerae which lacks any functional attRS1 sequences is useful as a live, oral vaccine for inducing immunological protection against cholera and a method for making same. The invention also features a killed, oral cholera vaccine comprising at least a first and a second V. cholerae strain, wherein at least one of the strains is a different serotype, and the vaccine also contains cholera toxin B subunit, produced by at least one of the serotypes.
摘要:
A genetically stable nontoxinogenic form of the Ogawa 395 strain of Vibrio cholerae which has a deletion mutation in both copies of the A.sub.1 -peptide-encoding gene, resulting in the loss of a gene sequence required for expression of a toxic A.sub.1 peptide is disclosed, as well as plasmids and methods for making the strain. The strain is useful as a live or dead oral vaccine.
摘要:
A live non-virulent vaccine composition and method for preparing the same comprising a virulent microorganismal strain which contains at least two mutations, wherein the first mutation results in an auxotrophic mutant which requires for proliferation, a nutrient which is normally available in the host tissues in an amount required by the auxotrophic mutant for proliferation and the second mutation results in the inability of the auxotrophic mutant to specifically transport the required nutrient from host-tissues into the auxotrophic mutant thereby producing an attenuated strain.