Stabilizers for freeze-dried vaccines
The present invention relates generally to the fields of immunology and vaccine technology. More specifically, the present invention relates to stabilizers for freeze-dried live attenuated immunogenic and/or vaccine compositions, which may comprise, inter alia, canine paramyxovirus. The invention further relates to stabilized, freeze-dried live attenuated immunogenic and/or vaccine compositions of, for example, canine paramyxovirus, which may contain these stabilizers. Other aspects of the invention are described in or are obvious from the following disclosure, and are within the ambit of the invention.
1. A stabilizer for a freeze-dried live attenuated canine distemper (CDV) and canine parainfluenza type 2 (cPi2) immunogenic composition comprising at least one reducing monosaccharide and at least one acid antioxidant compound, wherein the at least one acid antioxidant compound consists of aspartic acid; and wherein the at least one reducing monosaccharide consists of glucose, galactose, fructose, mannose, sorbose, or combinations thereof;
wherein the at least one reducing monosaccharide is at a concentration from 20% to 50% w/w and the at least one acid antioxidant is at a concentration from 1.5% to 6% w/w; and wherein the stabilizer further consists of:
(a) a bulking agent selected from dextran, maltodextrin, polyvinylpymolidone, hydroxyethyl starch, and combinations thereof, or
(b) a sugar alcohol selected from sorbitol, mannitol, xylitol, maltitol and combinations thereof, or
(c) a combination thereof; and
wherein the stabilizer is capable of reducing the amount of CDV and cPi2 titer lost during the freezing process by at least 0.5 logs.
2. The stabilizer of claim 1 wherein the reducing monosaccharide consists of glucose, galactose, or glucose combined with any one of galactose, fructose, mannose, or sorbose.
3. The stabilizer of claim 2 wherein the bulking agent is dextran present in an amount from about 10% to about 70% w/w.
4. The stabilizer of claim 3 wherein no sugar alcohol is present.
5. The stabilizer of claim 4 wherein and the reducing monosaccharide consists of glucose.
6. The stabilizer of claim 5 further comprising a non-reducing oligosaccharide, which consists of either raffinose or sucrose.
7. The stabilizer of claim 2 wherein the at least one reducing monosaccharide is glucose.
8. The stabilizer of claim 7 wherein the sugar alcohol consists of mannitol, sorbitol, or a combination thereof.
9. A liquid immunogenic composition comprising live attenuated paramyxoviruses comprising CDV and cPi2, mixed with the stabilizer of claim 1 .
10. The immunogenic composition of claim 9 , which further comprises at least one active immunogenic component derived from a pathogen other than paramyxovirus.
11. The immunogenic composition of claim 10 , wherein
(a) the at least one active immunogenic component is derived from a pathogen selected from Adenoviridae, Parvoviridae, Coronaviridae, Herpesviridae, Poxviridae, Rhabdoviridae, and combinations thereof; or
(b) the at least one active immunogenic component is selected from live attenuated canine adenovirus type 2 (CAV2), live attenuated canine parvovirus (CPV), and combinations thereof; or
(c) the at least one active immunogenic component is a viral vector comprising nucleotides encoding one or more heterologous, non-paramyxovirus immunogen(s); or
(d) the at least one active immunogenic component is a plasmid vector comprising nucleotides encoding one or more heterologous non-paramyxovirus immunogen(s).
12. The immunogenic composition of claim 9 , wherein the stabilizer components are present in the following w/v amounts, relative to the final liquid composition, prior to freeze-drying:
(a) the reducing monosaccharide is present from about 1% to about 5% (w/v);
(b) the aspartic acid is present from about 0.1% to about 0.2.5% or about 0.5% to about 7.5% (w/v); and
(c) the bulking agent is present from about 1.5% to about 5% (w/v).
13. The immunogenic composition of claim 9 , wherein the stabilizer components are present in the following w/v amounts, relative to the final liquid composition, prior to freeze-drying:
(a) the reducing monosaccharide is present from about 1.5% to about 4% w/v;
(b) the aspartic acid is present from about 0.5% to 7.5%; and
(c) the sugar alcohol is present from about 0.5% to 5.0%.
14. A freeze-dried stabilized live attenuated CDV and cPi2 immunogenic composition produced by freeze-drying the liquid composition of any one of claims 9 to 13 .