Bacterial vaccine
The present document discloses a method for producing a bacterial vaccine composition against bacterial diseases in animals, such as tetrapods or fish, wherein said bacterial vaccine composition comprises inactivated bacteria of the bacterium causing said bacterial diseases. The method involves exposing the bacteria to different growth conditions and then preparing a bacterial vaccine composition where the bacteria are exposed to different growth conditions. With vaccines prepared by the present method, bacterial diseases that previously had not been able to be cured could be treated or the effect of the treatment was more long-lasting.
1. A method for producing a bacterial vaccine composition against a bacterial disease in a tetrapod and/or a fish, wherein said bacterial vaccine composition comprises inactivated bacteria of the bacterium causing said bacterial disease, said method comprising:
i) preparing cultures A, B, C, D, F, G and H, or preparing all of cultures A to H, wherein:
culture A is prepared by first preparing a pre-culture “a” by inoculating said bacterium in 0.5 to 3.5% NaCl, and incubating before transferring said pre-culture “a” to a nutrient-rich bacterial growth medium with 0.5% to 3.5% NaCl, and incubating under microaerophilic conditions to prepare culture A;
culture B is prepared by first preparing a pre-culture “a” by inoculating said bacterium in 0.5 to 3.5% NaCl and incubating before transferring said pre-culture “a” to cell culture medium for fish or mammalian cells, and incubating under microaerophilic conditions to prepare culture B;
culture C is prepared by first preparing a pre-culture “b” by inoculating said bacterium in a cell culture medium for fish or mammalian cells, and incubating before transferring said pre-culture “b” to a solution typically comprising about 0.5 to 15% (w/v) gelatin with 0.05 to 1.5% glucose and incubating under microaerophilic conditions to prepare culture C;
culture D is prepared by first preparing a pre-culture “c” by inoculating said bacterium in blood, plasma or serum and incubating before transferring said pre-culture “c” to brain heart infusion medium with 0.05 to 1.5% glucose and incubating under microaerophilic conditions to prepare culture D;
culture E is prepared by inoculating said bacterium in enrichment broth and incubating under aerobic conditions to prepare culture E;
culture F is prepared by transferring bacteria from culture E or from enrichment medium containing for example blood, plasma and/or serum to 0.5 to 3.5% NaCl;
culture G is prepared by transferring bacteria from culture E or from enrichment medium containing for example blood, plasma and/or serum, to a cell culture medium for fish or mammalian cells;
culture H is prepared by transferring bacteria from culture E or from enrichment medium containing for example blood, plasma and/or serum to blood or plasma serum;
ii) inactivating the bacteria of the prepared cultures;
iii) optionally washing the inactivated cultures of step ii); and
iv) mixing the optionally washed and resuspended inactivated cultures to prepare the bacterial vaccine composition;
wherein step iv) of mixing optionally may be performed before step ii) or before step iii) instead of after step iii).
2. The method according to claim 1 , wherein step ii) is performed directly following step i).
3. The method according to claim 1 , wherein said bacterial disease is a co-infection.
4. The method according to claim 1 , wherein the ratio of cultures A-H is:
Culture
Relative %
A
8.6%
B
8.6%
C
8.6%
D
8.6%
E
40%
F
8.6%
G
8.6%
H
8.6%.
5. The method according to claim 1 , wherein the ratio of cultures A-H is
Culture
Relative %
A
10%
B
10%
C
10%
D
15%
E
40%
F
5%
G
5%
H
5%.
6. The method according to claim 1 , wherein said cell-culture medium for fish or mammalian cell is Leibowitz medium.
7. The method according to claim 1 , wherein the method is followed by mixing the bacterial vaccine composition obtained in said method with an adjuvant.
8. The method according to claim 7 , wherein said adjuvant is a mixture of Freunds Incomplete Adjuvant (FICA) and Curdlan.
9. The method according to claim 1 , wherein said bacterium is selected from the group consisting of Staphylococcus pseudintermedius, Aeromonas salmonicida, Tenacibaculum dicentrarchi, Moritella viscosa, Aliivibrio wodanis, Vibrio anguillarum, Aliivibrio salmonicida, Aliivibrio friggiae, Bizionia piscinecroseptica, Aliivibrio hodis, Aliivibrio heliae, Photobacterium pisciinfectiosa, Staphylococcus aureus , and Streptococcus equi.
10. The method according to claim 1 , wherein said tetrapod is a mammal, bird or amphibia.
11. The method according to claim 1 , wherein said fish is a teleost.
12. A bacterial vaccine composition obtainable or obtained by the method according to claim 1 .
13. The method according to claim 1 , wherein:
in the preparation of culture A, the nutrient-rich bacterial growth medium with 0.5% to 3.5% NaCl is Luria broth with 0.5% to 3.5% NaCl;
in the preparation of culture B, the cell culture medium for fish or mammalian cells is RPMI medium 1640 or Leibowitz medium;
in the preparation of culture C, the cell culture medium for fish or mammalian cells is RPMI medium 1640 or Leibowitz medium;
in the preparation of culture C, the 0.5 to 15% (w/v) gelatin is 3.2% (w/v) gelatin;
in the preparation of culture C, the 0.05 to 1.5% glucose is 1% glucose;
in the preparation of culture C, the pre-culture “b” is transferred to the gelatin/glucose solution in a ratio of ¼ of culture “b” to the gelatin/glucose solution;
in the preparation of culture D, the 0.05 to 1.5% glucose is 1% glucose;
in the preparation of culture D, the pre-culture “c” is transferred to the brain heart infusion medium in a ratio of ¼ of culture “c” to the brain heart infusion medium;
in the preparation of culture F, the 0.5 to 3.5% NaCl is 0.9% NaCl; and/or
in the preparation of culture G, the cell culture medium for fish or mammalian cells is RPMI medium 1640 or Leibowitz medium.
14. The method according to claim 8 , wherein said FICA and Curdlan are present in a ratio of 40% to 60%, 50% to 50% or 60% to 40%.
15. The method according to claim 10 , wherein said mammal is a dog, a cat, a horse, a cow, a sheep, a goat, a pig, or a human; or wherein said bird is a chicken, a hen or a turkey.
16. The method according to claim 11 , wherein said teleost is salmon, sea bass, or trout.