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Year 2009 - Volume 29, Number 11
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Hematological and immunological responses of Nile tilapia after polyvalent vaccine administration by different routes, 29(11):874-880
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ABSTRACT.- Silva B.C., Martins M.L., Jatobá A., Buglione Neto C.C., Vieira F.N., Pereira G.V., Jerônimo G.T., Seiffert W.Q. & Mouriño J.L.P. 2009. Hematological and immunological responses of Nile tilapia after polyvalent vaccine administration by different routes. Pesquisa Veterinária Brasileira 29(11):874-880. Laboratório de Diagnóstico e Patologia em Aqüicultura, Departamento de Aqüicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rodovia Ademar Gonzaga 1346, Itacorubi, Florianópolis, SC 88034-001, Brazil. E-mail: bcs85@hotmail.com
The efficacy of a polyvalent bacterin vaccine against Aeromonas hydrophila, Pseudomonas aeroginosa and Enterococcus durans administered by different routes in Nile tilapia was assessed by analyzing hematological and immunological parameters 7 and 21 days after vaccination. Treatments consisted of: non-vaccinated tilapia; tilapia vaccinated by intraperitoneal injection with 2x108 formalin-inactivated bacteria·mL-1; tilapia vaccinated orally with 2x107 formalin-inactivated bacteria·g-1, feed for 5 days; tilapia vaccinated by immersion bath in 2x107 formalin-inactivated bacteria·mL-1, for 20 minutes. Vaccinated fish groups presented higher hematocrit, number of erythrocytes and leukocytes than the non-vaccinated group. Serum agglutination titer of intraperitoneally vaccinated fish was higher on both evaluation periods for the three bacteria strains. Only on day 21 post-vaccination fish from the oral and immersion vaccination groups presented higher serum agglutination titer than the non-vaccinated fish for A. hidrophyla and E. durans. Serum antimicrobial activity in vaccinated fish was higher for P. aeroginosa and E. coli than in non-vaccinated fish on both evaluation periods. The different vaccine administration routes stimulated hematological and immunological responses in Nile tilapia 21 days post-vaccination, but intraperitoneal vaccination presented higher total number of leukocytes, lymphocytes and serum agglutination titer. |
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