Attenuated Mannheimia haemolytica Vaccines and Methods of Making and Use

Patent metadata

Field	Value
Publication number	US-2016199477-A1
Application number	US-201614991003-A
Country	US
Kind code	A1
Filing date	Jan 8, 2016
Priority date	Nov 8, 2012
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention provides attenuated M. haemolitica strains that elicit an immune response in animal against M. haemolitica, compositions comprising said strains, methods of vaccination against M. haemolitica, and kits for use with such methods and compositions. The invention further provides multi-valent vaccines, which provide protective immunity when administered in an effective amount to animals susceptible to “shipping fever” or bovine respiratory disease.

First claim

1 - 23 . (canceled)

24 . A vaccine comprising an attenuated Mannheimia haemolytica ( M. haemolytica ) A1 strain and an attenuated M. haemolytica A6 strain, which vaccine provides a safe and protective immune response in a bovine against both M. haemolytica strain A1 and M. haemolytica strain A6, or diseases caused by M. haemolytica strains A1 and A6

25 . The vaccine of claim 24 , wherein both the A1 and A6 strains contain nucleic acid deletions in their respective leukotoxin A (lktA) genes, which deletions have rendered the strains attenuated relative to the virulent parental strains A1 and A6 from which the attenuated strains A1 and A6 were produced.

26 . The vaccine of claim 25 , consisting essentially of the attenuated strains.

27 . The vaccine of claim 25 , further comprising an adjuvant.

28 . The vaccine of claim 25 , wherein a safe and protective intranasal dose of the vaccine comprises from about 1.19×10 6 to 1.19×10 7 CFU of the attenuated A1 strain and from about 9.2×10 5 to 9.2×10 6 CFU of the attenuated A6 strain.

29 . The vaccine of claim 25 , further comprising a pharmaceutically or veterinary acceptable vehicle, diluent or excipient and from about 1.19×10 6 to 1.19×10 7 CFU of the attenuated A1 strain and from about 9.2×10 5 to 9.2×10 6 CFU of the attenuated A6 strain.

30 . The vaccine of claim 28 , further comprising an adjuvant.

31 . The vaccine of claim 30 , wherein the adjuvant is inactivated bacteria, inactivated virus, fractions of inactivated bacteria, bacterial lipopolysaccharides, bacterial toxins, or derivatives or combinations thereof.

32 . The vaccine of claim 25 , which provides a protective immune response in a bovine against an experimental challenge of about 2.4×10 9 CFU of virulent M. haemolytica strain A1.

33 . The vaccine of claim 25 , further comprising at least one additional antigen associated with a bovine pathogen other than M. haemolytica.

34 . A method of vaccinating an animal comprising administering at least one dose of the vaccine of claim 25 .

35 . The method of claim 34 , wherein the animal is a bovine.

36 . The method of claim 34 , wherein the bovine is a calf that is 28 days or older.

37 . The method of claim 34 , wherein the vaccine is administered intranasally.

38 . An immunological composition suitable for the prevention of bovine respiratory disease caused by M. haemolytica, comprising the vaccine of claim 25 , and further comprising an immunologically effective amount of attenuated Pasteurella multocida and Histophilus somni.

39 . The composition of claim 38 , comprising from about 1.19×10 6 to 1.19×10 7 CFU of the attenuated A1 strain and from about 9.2×10 5 to 9.2×10 6 CFU of the attenuated A6 strain.

40 . The composition of claim 38 , further comprising an adjuvant.

41 . The composition of claim 40 , wherein the adjuvant is selected from inactivated bacteria, inactivated virus, fractions of inactivated bacteria, bacterial lipopolysaccharides, bacterial toxins, chitosan, derivatives and combinations thereof.

42 . The composition of claim 41 , wherein the adjuvant is a chitosan derivative.

Assignees

• Merial Inc

Inventors

• Bey Russell F
• Lawrence Paulraj Kirubakaran
• Simonson Randy R

Classifications

• A61K2039/522

  avirulent or attenuated · CPC title

• C07K14/285

  from Pasteurellaceae (F), e.g. Haemophilus influenza · CPC title

• A61K2039/70

  Multivalent vaccine · CPC title

• C12N1/36

  Adaptation or attenuation of cells · CPC title

• A61K2039/543

  intranasal · CPC title