Interference of vaccinal antibodies on serological diagnosis of leptospirosis in vaccinated buffalo using two types of commercial vaccines
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Data
2007-06-01
Autores
Nardi Júnior, Geraldo de
Genovez, Margareth Elide
Ribeiro, Márcio Garcia [UNESP]
Castro, Vanessa
Jorge, Andre Mendes [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Microbiologia
Resumo
A persistência de anticorpos vacinais representa um dos entraves para o sorodiagnóstico da leptospirose. Raros estudos dimensionam prospectivamente esse efeito na espécie bubalina. O presente trabalho objetivou traçar o perfil de aglutininas séricas anti-Leptospira spp.em búfalas vacinadas contra leptospirose com dois tipos de vacina comercial : bacterina e de membrana externa purificada e avaliar a interferência temporal dos títulos vacinais no sorodiagnóstico. Três grupos de 11 fêmeas bubalinas adultas: G1- controle não vacinado, G2 -vacinado com bacterina contendo seis sorovares e G3- recebeu vacina com membrana externa purificada de cinco sorovares, receberam reforço 30 dias pós primo vacinação (dpv) e duas revacinações semestrais nos dias 210 e 390. Foram colhidas amostras sorológicas nos dias 0, 15, 30, 45, 60 e a cada 30 dias até 540 dpv e analisadas pela reação de Soroaglutinação Microscópica-SAM frente aos sorovares presentes nas vacinas. G1 manteve-se sempre negativo. Ambas vacinas induziram resposta sorológica na SAM aos 15º dpv para todos os sorovares e revelaram títulos máximos ao redor do 45º e 60º dpv.: Pomona: G2 (1600) e G3 (3200); Hardjo: G2 e G3 (1600); Wolffi: G2 (800) e G3 (1600), Icterohaemorrhagiae: G2 e G3 (800), Grippotyphosa: G2 e G3 (200) e Canicola: G2 (NR) e G3 (400). Apesar da vacina de membrana externa não possuir o sorovar Wolffi, G3 revelou resposta para este sorovar, provavelmente pelo sorovar Hardjo vacinal. Os perfis sorológicos representados graficamente pela média geométrica dos títulos de aglutininas foram semelhantes, porém em G3 mais precoces e mais elevados que G2. Na revacinação houve aumento do nível de aglutininas, porém de menor intensidade que o anterior; e ao final de seis meses da segunda revacinação (540 dpv) eram quase nulos, demonstrando curta duração da interferência ao diagnóstico.
The vaccinal antibodies interference represents one of the Microscopic Agglutination test - MAT limitation in the animal leptospirosis serum diagnosis. Prospective studies showing the dimensions of this effect are rare in buffaloes. This study aimed to determine the anti-Leptospira serum agglutinin profile in vaccinated female buffaloes using two types of commercial vaccines against leptospirosis: bacterin (whole bacterial cell) and purified outer membrane and to evaluate the vaccinal interference on serum diagnosis. Three groups of 11 adult buffalo females were established: G1-control, non-vaccinated, G2- vaccinated with bacterin vaccine with six serovars, G3- outer membrane purified vaccine with five serovars. A booster dose was administrated 30 days after the first vaccination (dpv) and two re-vaccinations six months a part (210 and 390 dpv). Serum samples were collected on days 0, 15, 40, 45, 60 and every 30 days until 540 dpv. G1, G2 and G3 serum samples were submitted to MAT with the serovars present in the vaccines. G1 remained always negative. Both vaccines induced serologic responses in MAT at 150 dpv against all serovars and they revealed maximum titers around 45 and 60dpv as follows: Pomona: G2 (1600) and G3 (3200); Hardjo: G2 and G3 (1600); Wolffi: G2 (800) and G3 (1600); Icterohaemorrhagiae: G2 and G3 (800); Grippotyphosa: G2 and G3 (200) and Canicola: G2 (NR) and G3 (400). Even though, the Wolffi serovar is not present in the purified outer membrane vaccine, G3 showed a response to that serovar, probably due to cross reaction to the serovar Hardjo. The G3 titers were higher and appeared earlier than in G2, but with similar serologic profiles. At the re-vaccination there was an increase on agglutinin levels, but of less intensity than those previously observed. After six months from the second revaccination (540 dfv), G2 and G3 were almost negative, which demonstrated the short diagnostic interference.
The vaccinal antibodies interference represents one of the Microscopic Agglutination test - MAT limitation in the animal leptospirosis serum diagnosis. Prospective studies showing the dimensions of this effect are rare in buffaloes. This study aimed to determine the anti-Leptospira serum agglutinin profile in vaccinated female buffaloes using two types of commercial vaccines against leptospirosis: bacterin (whole bacterial cell) and purified outer membrane and to evaluate the vaccinal interference on serum diagnosis. Three groups of 11 adult buffalo females were established: G1-control, non-vaccinated, G2- vaccinated with bacterin vaccine with six serovars, G3- outer membrane purified vaccine with five serovars. A booster dose was administrated 30 days after the first vaccination (dpv) and two re-vaccinations six months a part (210 and 390 dpv). Serum samples were collected on days 0, 15, 40, 45, 60 and every 30 days until 540 dpv. G1, G2 and G3 serum samples were submitted to MAT with the serovars present in the vaccines. G1 remained always negative. Both vaccines induced serologic responses in MAT at 150 dpv against all serovars and they revealed maximum titers around 45 and 60dpv as follows: Pomona: G2 (1600) and G3 (3200); Hardjo: G2 and G3 (1600); Wolffi: G2 (800) and G3 (1600); Icterohaemorrhagiae: G2 and G3 (800); Grippotyphosa: G2 and G3 (200) and Canicola: G2 (NR) and G3 (400). Even though, the Wolffi serovar is not present in the purified outer membrane vaccine, G3 showed a response to that serovar, probably due to cross reaction to the serovar Hardjo. The G3 titers were higher and appeared earlier than in G2, but with similar serologic profiles. At the re-vaccination there was an increase on agglutinin levels, but of less intensity than those previously observed. After six months from the second revaccination (540 dfv), G2 and G3 were almost negative, which demonstrated the short diagnostic interference.
Descrição
Palavras-chave
leptospirose, búfalos, vacinação, sorodiagnóstico, SAM, buffalo leptospirosis, vaccination, serum diagnosis, MAT
Como citar
Brazilian Journal of Microbiology. Sociedade Brasileira de Microbiologia, v. 38, n. 2, p. 363-368, 2007.