Attenuated
The present invention provides attenuated P. multocida strains that elicit an immune response in animal P. multocida , compositions comprising said strains, methods of vaccination against P. multocida , and kits for use with such methods and compositions. The invention further provides novel, genetically-engineered mutations in P. multocida hyaD and nanPU genes, which are useful in the production of novel attenuated P. multocida bacterial strains.
1. A method of vaccinating an animal comprising administering a vaccine composition comprising an attenuated Pasteurella multocida ( P. multocida ) strain that provides a protective immune response in a bovine against P. multocida , or diseases caused by P. multocida;
wherein the attenuated strain comprises deletions or partial deletions in its hyaD gene and its nanPU gene, relative to the virulent parental strain from which the attenuated strain was produced; and
wherein the nanPU gene present in the attenuated P. multocida strain encodes a polypeptide having the sequence set forth in SEQ ID NO:13.
2. The method of claim 1 , wherein the bovine is from about 4 weeks old to 6 weeks old.
3. The method of claim 1 , wherein the parental strain hyaD gene comprises the sequence set forth in SEQ ID NO: 1and the parental strain nanPU gene comprises the sequence as set forth in SEQ ID NO: 5.
4. The method of claim 3 , wherein the parental strain hyaD gene consists of the sequence set forth in SEQ ID NO: 1 and the parental strain nanPU gene consists of the sequence as set forth in SEQ ID NO: 5.
5. The method of claim 1 , wherein the parental strain hyaD gene encodes a protein having the sequence set forth in SEQ ID NO: 2 and the parental strain nanPU gene encodes proteins having the sequences as set forth in SEQ ID NOs:10 and 11.
6. The method of claim 1 , wherein the attenuated strain expresses level(s) of HyaD and/or NanP, NanU peptide(s) that are significantly reduced or undetectable, relative to the attenuated strain's corresponding virulent parental strain.
7. The method of claim 1 , wherein the attenuated strain has mutations in the same genes, relative to its corresponding virulent parental strain, as does the attenuated strain deposited at the ATCC under the Patent Deposit Designation PTA-120624.
8. The method of claim 1 , wherein the attenuated strain is the strain deposited at the ATCC under the Patent Deposit Designation PTA-120624.
9. The method of claim 1 , wherein the attenuated strain has a deletion in its hyaD gene such that the attenuated strain produces a truncated protein having the sequence as set forth in SEQ ID NO: 4.
10. The method of claim 1 , wherein the attenuated strain has deletions in both its hyaD and nanPU genes, such that the attenuated strain does not produce wild type HyaD, NanP and NanU proteins, as does its corresponding parental strain, but instead produces truncated proteins having the sequences as set forth in SEQ ID NOs: 4 and 13.
11. The method of claim 1 , wherein the vaccine composition further comprises a pharmaceutically or veterinary acceptable vehicle, diluent or excipient, and an adjuvant.
12. The method of claim 11 , wherein the adjuvant is inactivated bacteria, inactivated virus, fractions of inactivated bacteria, bacterial lipopolysaccharides, bacterial toxins, or combinations thereof.
13. The method of claim 1 , wherein the composition further comprises an additional antigen(s) associated with a bovine pathogen other than P. multocida.
14. The method of claim 13 , wherein the additional antigen(s) elicits in a bovine an immune response against bovine respiratory disease (BRD).