Refrigerator-temperature stable influenza vaccine compositions
Methods and compositions for the optimization and production of refrigerator-temperature stable virus, e.g., influenza, compositions are provided. Formulations and immunogenic compositions comprising refrigerator-temperature stable virus compositions are provided.
1. A method for making a refrigerator-stable live cold-adapted influenza virus composition, comprising:
(a) clarifying a viral harvest comprising live cold-adapted influenza viruses by filtration, thereby producing a clarified viral harvest filtrate;
(b) subjecting the clarified viral harvest filtrate to continuous zonal centrifugation, thereby producing a further clarified viral harvest;
(c) sterilizing by sterile filtration the further clarified viral harvest, thereby producing a sterilized viral harvest; and
(d) combining the sterilized viral harvest with components of a stabilizer consisting of:
(i) 2% to 8% sucrose weight/volume (w/v), 0.75% to 2% arginine w/v, 0.02% to 0.15% glutamate w/v, 0.05% to 2% gelatin hydrolysate, and a buffer, or
(ii) 2% to 8% sucrose w/v, 0.75% to 2% arginine w/v, 0.05% to 2% gelatin hydrolysate, and a buffer;
thereby producing a refrigerator-stable live cold-adapted influenza virus composition, wherein each amount of each of the components of the stabilizer is the final amount in the virus composition, and which virus composition exhibits a potency loss of less than 1.0 log over a 12 month period when stored at 4° C. to 8° C.
2. The method of claim 1 , wherein the cold adapted influenza viruses comprise one or more of: an attenuated cold adapted influenza virus, a temperature-sensitive cold adapted influenza virus, or an attenuated cold-adapted temperature-sensitive influenza viruses.
3. The method of claim 1 , wherein the cold adapted influenza viruses comprise a genetic backbone of one or more of the following influenza viruses: A/Ann Arbor/6/60 and B/Ann Arbor/1/66.
4. The method of claim 1 , wherein the viral harvest is stabilized at 2° C. to 8° C. by the addition of another stabilizer prior to clarification in (a).
5. The method of claim 4 , wherein the other stabilizer comprises sucrose, phosphate and glutamate (SPG).
6. The method of claim 5 , wherein the other stabilizer is added to a final concentration of 0.2 M sucrose, 0.01 M phosphate and 0.005 M glutamate.
7. The method of claim 1 , wherein the viral harvest is clarified in (a) through a filter ranging from 0.2 microns to 1.5 microns.
8. The method of claim 7 , wherein the viral harvest is clarified in (a) by filtration through a filter ranging from 0.2 microns to 0.8 microns.
9. The method of claim 1 , wherein the viral harvest is clarified by filtration through a 5 micron filter in (a).
10. The method of claim 1 , wherein the viral harvest is clarified by depth filtration through one or more filters in (a).
11. The method of claim 10 , wherein the viral harvest is clarified in (a) through two or more filters.
12. The method of claim 10 , wherein the viral harvest is clarified in (a) by depth filtration through a filter ranging from 0.2 microns to 0.8 microns.
13. The method of claim 1 , wherein the continuous zonal centrifugation in (b) is performed over a sucrose density gradient.
14. The method of claim 13 , wherein the sucrose density gradient is a 10% to 60% sucrose gradient in phosphate buffer.
15. The method of claim 14 , wherein the sucrose gradient in phosphate buffer is at pH 7.2.
16. The method of claim 1 , wherein the continuous zonal centrifugation in (b) is performed at a temperature of 2° C. to 8° C.
17. The method of claim 16 , wherein the continuous zonal centrifugation is performed at a temperature of 4° C.
18. The method of claim 1 , which further comprises adding to the further clarified viral harvest in (c) a diluent comprising phosphate and glutamate.
19. The method of claim 18 , wherein the diluent is added to the further clarified viral harvest prior to the sterilizing in (c).
20. The method of claim 18 , wherein the diluent is added to the further clarified viral harvest to a final concentration of 0.2 M sucrose, 0.1 M phosphate and 0.005 M glutamate.
21. The method of claim 1 , which further comprises in (c) blending the sterilized viral harvest with at least one other sterilized viral harvest.
22. The method of claim 21 , wherein the sterilized viral harvest is blended with two other sterilized viral harvests.