Comparative protection of two different commercial vaccines against Yersinia ruckeri serotype O1 and biotype 2 in rainbow trout (Oncorhynchus mykiss).
Differentially extended specific protection by two commercial vaccines against Yersinia ruckeri serotype O1 biotype 2 was studied following 30s immersion exposure. Rainbow trout were challenged intra-peritoneally (i.p.) with Y. ruckeri serotype O1, biotype 2 (≈10(6) to 10(7)CFU/fish) at 4, 6 and 8 months after vaccination with vaccines containing either biotype 1 (AquaVac(®) ERM) or both biotypes 1 and 2 (AquaVac(®) RELERA™). The specific pattern of vaccine-mediated protection was evaluated by relative percentage survival (RPS) analysis at 4 and 6 months post-vaccination and by obtaining gross pathological observations at 4 and 8 months respectively. We determined specific significant and superior protection in terms of increased survivability in AquaVac(®) RELERA™ vaccinated fish and observed correspondingly fewer pathological changes. The challenge trials indicated a longer protection for at least 6 months without any booster vaccination. A specific and adaptive response induced by AquaVac(®) RELERA™ vaccine against Y. ruckeri biotype 2 was clearly indicated. In addition, some degree of cross protection rendered by AquaVac(®) ERM containing biotype 1 during infection with Y. ruckeri biotype 2 was also noted.
Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, Denmark. sid@life.ku.dk
S
S
Deshmukh
M K
MK
Raida
I
I
Dalsgaard
J K
JK
Chettri
P W
PW
Kania
K
K
Buchmann
D000818:Animals; D001428:Bacterial Vaccines / Q000276:immunology / Q000627:therapeutic use*; D005393:Fish Diseases / Q000276:immunology / Q000382:microbiology / Q000473:pathology / Q000517:prevention & control*; D017686:Oncorhynchus mykiss / Q000276:immunology / Q000382:microbiology*; D016896:Treatment Outcome; D015009:Yersinia Infections / Q000276:immunology / Q000382:microbiology / Q000473:pathology / Q000517:prevention & control / Q000662:veterinary*; D044124:Yersinia ruckeri / Q000276:immunology*
D001428:Bacterial Vaccines