Cross-protection between experimental anti-leptospirosis bacterins

Brazilian Journal of Microbiology

Cristina Corsi Dib²  Amane Paldês Gonçales¹  Zenaide Maria De Morais¹  Gisele Oliveira De Souza¹  Fabiana Miraglia¹  Patricia Antonia Estima Abreu¹  Silvio Arruda Vasconcellos¹ 

[1] ,Instituto Biológico Centro de Pesquisa e Desenvolvimento de Sanidade Animal Laboratório de TuberculoseSão Paulo SP ,Brazil

关键词: Pomona;    hamsters;    bacterin;    cross-protection;   

DOI  :  10.1590/S1517-83822014000300042

来源: SciELO

【 摘 要 】

We investigated the existence of cross-protection between two anti-leptospirosis monovalent experimental bacterins produced with two strains of Leptospira serogroup Pomona: Fromm strain of serovar Kennewicky, isolated from pigs in the United States, and strain GR6 of serovar Pomona isolated from pigs in Brazil. Both were added of aluminum hydroxide as an adjuvant. Experimental bacterins were tested with the hamster potency test in order to assess protection provided against the disease and against the establishment of kidney infection. Controls were polyvalent commercial vaccine produced with Leptospira strains isolated outside Brazil, which included a representative of Pomona serovar, or Sorensen solution added of aluminum hydroxide adjuvant. The challenge was performed with cross-strains of serogroup Pomona tested in accordance with international standards established for the potency test. After 21 days of the challenge, survivors were killed to evaluate the condition of Leptospira renal carrier. Experimental bacterins protected hamsters against homologous and heterologous strains, demonstrating the existence of cross-protection. The commercial vaccine protected the hamsters challenged with both strains, but there was a high proportion of animals diagnosed as renal carriers when the challenge was performed with strain GR6, isolated from pigs in Brazil.

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