Seroepidemiology of brucellosis: comparison between buffalos, bovines, goats and sheep from the northeast of Argentina

Brucellosis is an infectious disease that affects many domestic animals and is caused by a bacterium, Brucella spp. Since 1998, SENASA developed a mandatory Brucellosis Control and Eradication National Program that includes bovines and, in 2005, included buffaloes. It is based on S19 Brucella abortus vaccination, diagnosis and slaughter of positive animals. The aim of this work was update brucellosis situation in buffaloes, bovines, goats and sheep from Formosa, Argentina. Results of serological test in a reference laboratory (CIT) were analyzed, and a study of prevalence and an epidemiologic survey was carried out in order to establish risk factors for the presence of brucellosis. "Susceptible species" and "flock size" were the two variables selected for the X2 and Odds Ratio tests, in order to determine the risk of occurrence of brucellosis. Positive animals' proportion between 2014 and 2016 were: 1.9--6.1%; 0.1--0.9%; 1.6--0.7% and 0% for buffaloes, bovines, goats and sheep respectively. Prevalence was 14% in buffaloes, 0.2% in bovines, 6.8% in goats and 0% for sheep. The higher prevalence was found in buffaloes, and it was larger in flocks that had 100 to 500 animals than in others ranks. A significant difference (p