Evaluation of the Mycobacterium tuberculosis SO2 vaccine using a natural tuberculosis infection model in goats

J. Bezos, C. Casal, J. Álvarez, A. Roy, B. Romero, A. Rodríguez-Bertos, C. Bárcena, A. Díez, R. Juste, C. Gortázar, E. Puentes, N. Aguiló, C. Martín, L. de Juan, L. Domínguez

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13 Scopus citations


The development of new vaccines against animal tuberculosis (TB) is a priority for improving the control and eradication of this disease, particularly in those species not subjected to compulsory eradication programmes. In this study, the protection conferred by the Mycobacterium tuberculosis SO2 experimental vaccine was evaluated using a natural infection model in goats. Twenty-six goats were distributed in three groups: (1) 10 goats served as a control group; (2) six goats were subcutaneously vaccinated with BCG; and (3) 10 goats were subcutaneously vaccinated with SO2. Four months after vaccination, all groups were merged with goats infected with Mycobacterium bovis or Mycobacterium caprae, and tested over a 40 week period using a tuberculin intradermal test and an interferon-γ assay for mycobacterial reactivity. The severity of lesions was determined at post-mortem examination and the bacterial load in tissues were evaluated by culture. The two vaccinated groups had significantly lower lesion and bacterial culture scores than the control group (P < 0.05); at the end of the study, the SO2 vaccinated goats had the lowest lesion and culture scores. These results suggest that the SO2 vaccine provides some protection against TB infection acquired from natural exposure.

Original languageEnglish (US)
Pages (from-to)60-67
Number of pages8
JournalVeterinary Journal
StatePublished - May 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd


  • Caprine
  • Mycobacterium tuberculosis SO vaccine
  • Natural infection
  • Tuberculosis


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