Jacqueline Ribeiro de Castro

Sorovares de Leptospira spp. predominantes em exames sorológicos de caninos e humanos no município de Uberlândia, Estado de Minas Gerais

INTRODUCTION:This study aimed to verify the occurrence of the principal Leptospira spp. serovars in domestic dogs and humans, notified in 2008, and the main risk factors in a geographic approach to the disease in the City of Uberlândia, State of Minas Gerais, Brazil. METHODS: Canine blood serum samples (n=268) from different districts, belonging to the Northern, Southern, Eastern, Western and Central Sanitary Districts of Uberlandia, were collected during an animal vaccination campaign against rabies, in August 2008. A geographic approach to the city was conducted, including evaluation of locations in peripheral areas, waste landfills, garbage collection, rodent notification, human leptospirosis cases and overflow flood areas, during 2008. Leptospirosis was diagnosed using the microscopic agglutination test (MAT), the gold standard for animal and human leptospirosis diagnosis. RESULTS: Dogs mainly reacted to Autumnalis (34.2%) and Tarassovi (23.7%) serovars, while in humans, predominance of Tarassovi serovars occurred in the cases registered. The occurrence of these serovars could be related to an infection source common to both species, or dogs could be the infection source for humans. The Eastern Sanitary District showed a greater number of reactive dogs. CONCLUSIONS: Leptospirosis occurred in dogs and humans of the City of Uberlandia in 2008. This often neglected disease must be prevented because represents a public health risk and resembles other endemic illness like dengue.

Prevalence of Neospora caninum antibodies in sheep flocks of Uberlândia county, MG

Neosporosis is a parasitic disease that occurs in sheep and is associated with reproductive failure. The aim of this study was to verify seroprevalence of Neospora caninum antibodies in 12 sheep flocks in Uberlândia county, Minas Gerais, Brazil, using Indirect Immunofluorescence Assay (IFA). A total of 334 sheep blood samples were analyzed and an epidemiologic questionnaire was applied for each farm in order to correlate with risk factors of neosporosis: gender, age, breed, abortion problems, contact with cattle and dogs, and presence of wild canids. The prevalence of Neospora caninum antibodies in sheep was 8.1%, with titers ranging from 50 to 3200 and 83.3% of farms detected at least one ovine reactive. There was statistically significant difference in flocks with abortion problems associated with the presence of Neospora caninum antibodies (p < 0.05).

Seroprevalence and risk factors of antibodies against Leptospira spp. in ovines from Uberlândia municipality, Minas Gerais state, Brazil

The objectives of the present study were to verify the seroprevalence of anti-Leptospira spp. antibodies, identify the most frequent serovars and the risk factors associated with the infection in Uberlândia, Minas Gerais, Brazil . A total of 334 ovines blood samples were collected in 12 farms from Uberlândia municipality to be evaluated by means the Microscopic Agglutination Test (MAT) against 22 serovars of Leptospira spp. and an epidemiologic questionnaire was applied for each farm in order to correlate with risk factors of leptospirosis: sex, age and breed as well as contact with cattle, contact with dogs and presence of rodents. The prevalence of seropositive to MAT was found in seventy four ovines (22.2%; CI 95% 17.6-26.4%), with titers ranging from 100 to 3200. The most frequent serovars identified were: Hardjo, Autumnalis, Hardjo and Wolffi association and Grippotyphosa. Statistically significant differences were found in males, pure breeds and presence of rodents (p<0.05). The prevalence of anti-Leptospira spp. antibodies found in the present study demonstrated that this bacterium occurs in ovines of Uberlândia municipality, MG, Brazil . The need for the adoption of efficient management for the control of rodents and infection in ovines in order to avoid leptospirosis in the local flocks and future transmission to humans.

Pesquisa de anticorpos anti-Brucella abortus e anti-Brucella ovis em ovinos no município de Uberlândia, MG

The first epidemiologic inquiry to Brucella abortus (B. abortus) and Brucella ovis (B. ovis) was carried out in sheep from Uberlândia county, MG. A total of 334 blood serum samples of sheep from both sexes and different ages and breeds were collected in 12 farms. An epidemiologic questionnaire was applied for each farm. Tests for B. abortus and B. ovis antibodies were Buffered Acidified Antigen and Complement Fixation, respectively. None of the sheep was reactive to B. abortus and B. ovis; however, the adoption of sanitary measures is important to avoid the introduction of infections caused by these bacteria.

Cinética da resposta imune humoral de cães jovens imunizados contra Leptospira interrogans

The objective was to analyze the humoral immune response against Leptospira interrogans using the microscopic agglutination test (MAT) in 26 young dogs, and 17 mixed breed (Group A) and nine mixed breed (Group B) of both sexes, pertaining to kennels and home environments in Uberlandia, Minas Gerais. Dogs were vaccinated with commercial inactivated polyvalent bacterin with Canicola, Grippotyphosa, Icterohaemorrhagiae and Pomona serovars. The immunization schedule was based on three immunizations. The first vaccination was performed at forty-five days of age, considered day zero, and after two boosters at intervals of thirty days each. Seven blood samples from each dog were made from time zero up to 180 days post-vaccination, at intervals of thirty days each. Titles have not been detected pre-vaccination against serovars Canicola, and Icterohaemorrhagiae Grippotyphosa on day zero. Only one dog in group A was reactive with a titer of 1:100 against Pomona in the first harvest. There was no statistical difference between the agglutinating titers between Groups A and B (p>0.05) induced by commercial vaccine used, except at harvest II (p<0.05), in which the group B presented evidence to serovar Autumnalis in all dogs evaluated, whereas in group A, 64.7% of dogs were not reactive to any serovar tested. There were on the 30th title to serovar Autumnalis that persisted until 180 days post-vaccination in both groups, varying only the intensity of immune response without significant statistical difference. To assess the efficiency of vaccine culture anti-Leptospira this research to warn the risks infection that dogs are vaccinated annually submitted.