Inquérito sorológico e molecular da brucelose canina no município de Natal, Estado do Rio Grande do Norte

Abstract

The aim of this study was to determine the occurrence of anti-rough Brucella and anti-smooth Brucella antibodies in dogs from the county of Natal, Rio Grande do Norte state, Brazil, as well as to identify risk factors associated with positivity and to perform molecular detection of the agent in seropositive animals. Sera from 416 dogs attended in veterinary clinics during the period from March to November 2011 were used. For the serological diagnosis of rough Brucella the agar gel immunodiffusion (AGID) test, using antigen of lipopolysaccharides and proteins from Brucella ovis, strain Reo 198, was carried, and for smooth Brucella the buffered plate agglutination test (BPAT) was used. From seropositive animals, blood samples with sodium citrate were collected for the diagnosis by polymerase chain reaction (PCR). Frequency of anti-rough Brucella antibodies was 28.9% (120/416). All animals were negative for anti-smooth Brucella antibodies. Of the 80 seropositive animals Brucella spp. DNA was amplifi ed in three (3.8%). Risk factors associated with the seropositivity were not identifi ed. It was concluded that rough Brucella infection is present in the county of Natal, as well as it is suggested the serological monitoring of animals attended at clinics aiming the identifi cation of sources of infection.