Estimating the probability of freedom from bovine brucellosis in the Galapagos Islands

Bovine brucellosis is a worldwide zoonotic disease that still burdens several countries in the Mediterranean, Asia, Africa and Latin America. Although the disease is present in Ecuador, the Galapagos Islands seem to be free from the disease based on a survey conducted in 1997 where all tested animal...

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Bibliographic Details
Published in:Epidemiology and infection 2019-01, Vol.147, p.1-e9, Article e9
Main Authors: Gioia, G, Vinueza, R L, Cruz, M, Jay, M, Corde, Y, Marsot, M, Zanella, G
Format: Article
Language:English
Subjects:
Animals
Bovidae
Brucellosis
Cattle
Disease
Enzyme-linked immunosorbent assay
Estimation
Farms
Islands
Life Sciences
Milk
National parks
Polls & surveys
Serology
Short Paper
Veterinary medicine
Zoonoses
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Summary:Bovine brucellosis is a worldwide zoonotic disease that still burdens several countries in the Mediterranean, Asia, Africa and Latin America. Although the disease is present in Ecuador, the Galapagos Islands seem to be free from the disease based on a survey conducted in 1997 where all tested animals showed negative results. This study aimed at estimating the probability of freedom from brucellosis in this Ecuadorian province in 2014. A survey was implemented on the three main cattle-producing islands of the province: Santa Cruz, Isabela and San Cristóbal. Thirty-three cattle farms and 410 cattle were tested for brucellosis using the Rose Bengal test and indirect ELISA. All animals showed negative results for both tests. Probability of freedom was estimated at 98%, 91% and 88% for Santa Cruz, Isabela and San Cristóbal, respectively, considering a herd-level design seroprevalence of 20% and animal-level design seroprevalence of 15%, and assuming a perfect specificity of the survey. The negative results found in 1997 and present surveys suggest that the Galapagos Islands are free from bovine brucellosis.
ISSN:0950-2688
1469-4409
DOI:10.1017/S0950268818002534