Curva de anticorpos pós-vacinais em ovinos imunizados com uma ou duas doses de bacterina oleosa anti-leptospirose, produzida com a sorovariedade Hardjo, tipo Hardjoprajitno, estirpe Norma, isolada no Brasil

Translated title of the contribution: Post vaccinal antibodies profile of sheep immunized with one or two doses of an oil emulsified anti leptospirosis bacterin produced with serovar Hardjo, type Hardjoprajitno, strain Norma, isolated in Brazil

Geder Paulo Herrmann, Rogêrio Oliveira Rodrigues, Carlos Eugênio Soto Vidal, Gustavo Machado, Élvio Carlos Moreira, Rômulo Cerqueira Leite

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

It was compared the level of antibodies of sheep immunized with one or two doses of an oil bacterin produced with serovar Hardjo, type Hardjoprajitno, strain Norma, isolated from cattle urine in Brazil. Cultures of 2x108 leptospires/mL were inactivated with formalin 0.3%, final concentration and emulsified in oil Emulsigen® 12%. The vaccine dose was standardized to the concentration of 1x108 leptospires/mL. Forty adult sheep, Santa Inês breed from a herd free of leptospirosis by clinical and serological examinations during one year were chosen for the experiment. Group A (n=15) received two subcutaneous 3.0 mL vaccine dose, interval of 30 days. Group B (n=15) received one subcutaneous 3.0 mL vaccine dose. Group C (control) received one subcutaneous dose of 3.0 mL of 0.85% sodium chloride solution. Post vaccination antibody titers were measured by microscopic agglutination test (MAT) and an in house enzyme linked immunosorbent assay (ELISA) every 30 days during 120 days. At 30 days post-vaccination, the titers of the groups A and B ranged from 80 to 160. In group A, after the booster dose, the titers increased two to four times until 3,200, while in the group B the titers were lower than 160 and decreased by one to two times after 60 days after vaccination. Using a single dose, the antibodies persisted for only 30 days, and with two doses with 30 days of interval, the antibodies were detectable for 60 days through the MAT test and 120 days through the ELISA. The MAT test detected IgM titers of vaccine only for 60 days, while the ELISA was able to detect antibodies during the 120 days. In the negative control group, nonspecific reactions occurred in the ELISA up to titer 80, however titers in the MAT of the same animals remained at zero. The ELISA test can be used to assess anti leptospire vaccinal antibody level to the serovar Hardjo, type Hardjoprajitno, strain Norma in sheep.

Translated title of the contributionPost vaccinal antibodies profile of sheep immunized with one or two doses of an oil emulsified anti leptospirosis bacterin produced with serovar Hardjo, type Hardjoprajitno, strain Norma, isolated in Brazil
Original languagePortuguese
Pages (from-to)683-689
Number of pages7
JournalPesquisa Veterinaria Brasileira
Volume31
Issue number8
DOIs
StatePublished - Aug 2011

Keywords

  • Adjuvant
  • ELISA
  • Sheep
  • Vaccine

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