Brucellosis in dairy cattle and goats in northern Ecuador

Keith P. Poulsen, Frank T. Hutchins, Chase M. McNulty, Marlene Tremblay, Carmen Zabala, Veronica Barragan, Luis Lopez, Gabriel Trueba, Jeffrey W. Bethel

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The purpose of this study was to conduct a convenience study for brucellosis prevalence in dairy-producing animals in northern Ecuador. In total, 2,561 cows and 301 goats were tested. Cattle sera were tested using the Rose Bengal card antigen test (RBCT), yielding an overall apparent prevalence of 5.5% (95% confidence interval [95% CI] = 4.7- 6.5%) and true prevalence of 7.2% (95% CI = 6.0-8.5%). Prevalence varied by herd size and was highest in larger commercial herds. Polymerase chain reaction was used to test goat milk and lymph nodes, resulting in 9% and 8% positivity, respectively. The RBCTs from goat sera yielded an adjusted true prevalence of 17.8% (95% CI = 6.2-44.2%). Our findings are similar to other overall prevalence estimates for dairy herds but show higher prevalence in commercial herds compared with small groups (less than five animals). We also identify urban milking goats living in metropolitan Quito as a potential source of zoonosis.

Original languageEnglish
Pages (from-to)712-715
Number of pages4
JournalAmerican Journal of Tropical Medicine and Hygiene
Issue number4
StatePublished - Apr 2014


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