Abstract
In this project, we selected the field isolates with high virulence and antigenicity of grouper iridovirus (GIV) and nervous necrosis virus (NNV) as the seed virus for vaccination by immersion and injection. Different adjuvant formulas and administration rotes were tested for vaccine efficacy. The safety tests of bivalent vaccines with different formulas of adjuvant demonstrated that the vaccine mixed with PCNE oil adjuvant was better in growth of fish. The vaccine efficacy of vaccine mixed with aluminum adjuvant showed the highest protections against NNV and GIV challenge tests. The relative percent survival (RPS) values of NNV and GIV challenge tests were revealed to 77% and 66.6%, respectively. The vaccine efficacy of injection type bivalent vaccine was evaluated by intramuscular injection with 106.2TCID50/mL NNV virus and the result revealed the RPS was 75%. In addition, the vaccine efficacy of injection type bivalent vaccine was evaluated by intraperitoneal injection with 107TCID50/mL GIV virus and the result revealed the RPS was 88%. These results demonstrated the effective protections of injection and immersion- types bivalent vaccines for vaccination against NNV and GIV in giant grouper (Epinephelus lanceolatus).
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Abstract
For understanding efficacy of commercial inactivated rabies vaccines and oral vaccine and the serological surveillance of rabies in wildlife, the rapid fluorescent focus inhibition test (RFFIT) for determining the levels of antibody to rabies virus in serum was introduced. After ferret badgers were vaccinated with each of 4 commercial inactivated rabies vaccines (vaccines A, B, C, and D), prescribed for dog and cat, seroconversion (titer >0.5 IU/mL) in vaccinated ferret badgers were detected at 2 weeks post-vaccination. The seropositive rates of ferret badger groups A, B, C were 83% (5/6) at 6 months post-vaccination in comparison with in the group D, which was decreased over time and all titers were less than 0.5 IU/mL after 4 months post-vaccination. In the efficacy test of oral vaccine, seroconversion rate was 26.7% (4/15) at 2 weeks post-vaccination and 40% (6/15) at 1 month post-vaccination. In gem-faced civet, the neutralizing antibody (titer > 0.5 IU/mL) can be elicited after 2 weeks post-vaccination with no observed adverse effect. Forty-six sera from ferret badger, crab-eating mongoose, gem-faced civet and Formosan macaque were tested by the RFFIT. Two sera of ferret badgers which showed nervous clinical signs and illness were tested positive. One of the ferret badgers died and tested positive by fluorescent antibody test.
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