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Item AVALIAÇÃO DO EFEITO DA INOCULAÇÃO DE Salmonella Enteritidis EM OVOS EMBRIONADOS E EM PERUS DE UM DIA(Universidade Federal de Goiás, 2008-08-28) ANDRADE, Carla Yoko Tanikawa de; CAFÉ, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; STRINGHINI, José Henrique; http://lattes.cnpq.br/8505634095383289; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467This study was divided into two experiments, referring to incubation and early phase. The incubation experiment had as principal aims evaluated incubation yield, the capacity to penetrate through the eggshell and the ability to colonize the gastrointestinal tract. Four hundred fertilized turkey eggs for BUT9 strain were distributed in four treatments: CCS and CCM (inoculation of placebo in eggshell and air cell, respectively); ICS and ICM (inoculation with 4,2 X 104 UFC/mL of Salmonella enterica subspecies enterica sorovar Enteritidis in eggshell and air cell, respectively). Incubation parameters calculated were: fertility, total hatchability, hatchability of fertile eggs and poult yield. Salmonella was examined in eggshell, inner and outer membranes, albumen/yolk, embryo and, after hatched, in meconium in all poult. Qualitative results were analyzed by qui-square test. It was verified that the agent maintained feasible in eggshell during the hole incubation and migrated to egg components. Incubation parameters were not affected by the pathogen inoculated in eggshell. It was also observed that Salmonella Enteritidis inoculated in air cell determined early embryo mortality, while the control treatment influenced the mortality periods in relation with CCS. The intestinal colonization of Salmonella occurred in poults derived from eggshell experimental inoculation. In the second experiment, 135 poults derived from inoculation through eggshell and drinking water were evaluated by the effects of Salmonella Enteritidis to colonize the gastrointestinal tract, determine systemic infection, hurt the intestinal integrity and change the performance variables. At 10, 20 and 28 days, turkeys and feed were weighted to constitute calculation of performance variables. After weighage, five turkeys from each treatment were necropsied to obtain datas of weight and bacterial isolation of intestine, liver, spleen and heart. Qui-square test was employed to qualitative variables and the Anova procedure to quantitative variables and average compared by Tukey test (5%). The intestinal colonization increase significantly during early phase in treatment inoculate through eggshell, but none in treatment inoculated in drinking water. The intestine showed maximum development at 10 days and higher weight at first, 10th and 28th when Salmonella was present. The digestive and absorptive capacity was impaired in infected birds. Salmonella was capable of colonized gastrointestinal tract and established systemic infection. Mortality rate was high during first week of age, with less clinical signs or anatomopathological lesionsItem Inquéritos sorológicos em equídeos e aves silvestres para detecção de anticorpos anti-arbovírus de importância em saúde pública no Brasil(Universidade Federal de Goiás, 2011-12-06) ARAUJO, Francisco Anilton Alves; LINHARES, Guido Fontgalland Coelho; http://lattes.cnpq.br/6261928164195145; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467This study determined the prevalence of hemagglutination-inhibition antibodies against alphaviruses in horses during an epizootic event by Eastern Equine Encephalitis virus in the state of Paraiba, Brazil, in 2009 and compared the results between the techniques of hemagglutination inhibition and serum neutralization test in microplates. The results of15 arboviruses obtained from serological surveys on horses in Brazil from 2007 to , as well as the results for the arboviruses found in two serological surveys on wild birds in the state of Para, between 2007 and 2008 2009 were analyzed,. In Paraiba, blood was collected from 188 horses during other surveys of 4.402 animals and 544 wild birds. The material was tested by the hemagglutination inhibition technique, neutralization was performed in microplates aiming at virus isolation. In Paraíba, we obtained a true prevalence of 62.2% for Eastern Equine Encephalitis and hemagglutination inhibition test had 79.5% sensitivity and 87.3% specificity . In Brazil, the prevalence rate was 33.3% for arboviruses, 20.6% for flaviviruses, 14.1% for alphavirus and 10.1% for bunyavirus. In birds, the positivity was 28.4%, being 14.7% for alphaviruses, 9.5% for flaviviruses and 7.4% for bunyavirus. There was a high circulation of antibodies against Eastern Equine Encephalitis in inapparent-host animals and the hemagglutination inhibition test can be recommended as screening method. The other arboviruses surveyed were found in animals of the nine states with a significant difference in the prevalence from the motivation of the survey. Migratory birds have proved to be important amplifiers of these agents .Item Chlamydophila spp.,Mycoplasma gallisepticum E Mycoplasma synoviae em psitacídeos (filo: Cordata, ordem: Psittaciformes) de diferentes cativeiros no estado de Goiás(Universidade Federal de Goiás, 2012-02-29) CARVALHO, Andréa de Moraes; LINHARES, Guido Fontgalland Coelho; http://lattes.cnpq.br/6261928164195145; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467The investigation of pathogens in wild animals can be considered an important tool for conservation of species and ecosystem. Chlamydiosis was first identified and is a common disease in psittacines. It is considered the most important zoonosis spread by these birds. Due to its infectious nature, this disease is studied all around the world. The mycoplasmosis is a common respiratory disease in pigeons, chickens and birds. However, parrots can be affected if they get in contact with the agent, and they can become a source of infection for the environment and for other birds. This study aimed to identify, through the polymerase chain reaction PCR technique, bacteria Chlamydophila spp., Mycoplasma gallisepticum and M. synoviae in captivity parrots in three different facilities in Goiás state: CETAS Centro de Triagem de AnimaisSilvestres, a conservation and a comercial captivity. The results were compared in order to determine wich facility is more perserved or contaminated by pathogens. For Chlamydophilaspp, CETAS facility showed 25.6% of positive samples, while the commercial captivity showed 26.4%, and the conservation captivity had no positive samples (0%). For the presence of Mycoplasma gallisepticum, CETAS presented 21.62% of positive samples, while the commercial and conservation captivity showed 15.7% and 14% of positive samples, respectively. M. synoviae was almost absent in CETAS (2.7%) and in conservation captivity (1.3%), and absent in commercial captivity (0%). The results found were compared using Fischer s exact test, where CETAS and commercial captivity were more infected than conservation captivity. The bacteria studied were present in different species of parrots, especially on the genera Ara, Aratinga and Amazonas. The presence of Chlamydophila and Mycoplasma sp. should be investigated in captive birds, since it reveals the presence of the agents in the population, allowing its control.Item Mastite subclínica: patógenos isolados e respectiva sensibilidade antimicrobiana, variação da contagem de células somáticas e fatores de risco(Universidade Federal de Goiás, 2010-02-25) COSTA, Anna Carolina da; NICOLAU, Edmar Soares; http://lattes.cnpq.br/9601723963736071; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467This study was conducted on 12 dairy farms and in laboratories Bacteriology and Quality of Milk, both of the School of Veterinary Medicine Federal University of Goias objective of this study to characterize the microorganisms in milk from cows with subclinical mastitis and relate the pathogens identified with the variation of cell count somatic (CCS), also identify the risk factors and the likely sources of infection to subclinical mastitis, by visual observations, application of questionnaires, by isolation and identification of pathogens from the hands of milkers, swabs and solutions liners and pre posdipping. The profile sensitivity to key antimicrobial and bactericidal effect of the extract of Calendula officinalis has been determined on the pathogens isolated in most cases subclinical mastitis in herds. To evaluate the variation of CCS in relation to the pathogens involved, we used analysis of frequency and Chi-square, and the risk factors were analyzed for Logistic regression to test associations between variables and increased CCS. It was found that agents with higher frequency of isolation were S. aureus (28.8% of samples), E. coli (19.8%) and Enterobacter spp. (11.3%). CCS average herd was approximately 875 x 103cél/mL, and the type etiologic agent of a significant influence on the variation in SCC. It was found that S. aureus and Streptococcus spp. were responsible for greater increase in SCC, with an average of 1192 x 1174 x 103cél/mL and 103cél/mL, respectively. This variation was significantly higher (p <0.05) when compared to the average SCC in milk were the other isolates microorganisms: S. coagulase negative, Pseudomonas spp., E. coli and Enterobacter spp. It was found that the risk factors that showed significant association with increased SCC were unsatisfactory hygiene environment and milker, inadequate drying of the teats, and factors related to milking equipment, such as poor maintenance and inadequate cleaning. The hands of the milkers and the sets of liners were able to convey both the infectious agents as the environment, important in epidemiology of bovine mastitis. It was also concluded that the extract of marigold showed bactericidal activity in vitro against S. aureus isolates, and antimicrobial agents used showed variation in the spectrum of sensitivity.Item Investigação epidemiológica de epizootia de febre amarela em primatas não-humanos em Goiás, no período de 2007 a 2010(Universidade Federal de Goiás, 2011-03-30) DELFINO, Denizard André de Abreu; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; SOUZA, Aires Manoel de; http://lattes.cnpq.br/2205630749435756; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467The objective of this study was to carry out and analyze the actions taken to control the yellow fever epizootic in non-human primates, recorded in November 2007 to March 2010 in Aparecida de Goiania, Goias Brazil. The primary epidemiological information on the disease was obtained from the Municipal Health Secretariat, by the local Center for Zoonosis Control. Data were analyzed from the outbreak reports. In A descriptive study, the control actions, such as blocking vaccine against yellow fever by the municipal health department and the evaluation of physical barriers to contain the virus, were verified. The inspection of 58 dead nonhuman primates, representing 100% of the animals found in the period previously mentioned, was used. From these, 34.48% (20/58) were able to have samples collected, according to the specifications of the Epizooty Handbook Of this amount (58), 27.59% (16/58) of monkeys were collected and3.45% (2/58) presented positivity for yellow fever virus. By evaluating the actions that contributed to the epidemiological assessment at the city, it is emphasized the occurrence of three deaths among genera and species of nonhuman primates, Alouatta caraya, Cebus apella and Callithrix spp, with the circulation of yellow fever virus in two cities with epidemiological distinct characteristics. The areas which showed the highest incidence of deaths of monkeys had also the greatest degree of urban growth, characterized by recent environmental changes and residual maintenance of natural areas.Item Detecção de Enterobacteriaceae e Chlamydophila spp. em psitacídeos provenientes do centro de triagem de animais selvagens de Goiás(Universidade Federal de Goiás, 2010-02-26) HIDASI, Hilari Wanderley; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; LINHARES, Guido Fontgalland Coelho; http://lattes.cnpq.br/6261928164195145; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467The wild animal trafficking is the third largest illegal activity in the world, ranking only behind the trafficking of weapons and drugs. The birds are the animals most affected by the illegal trade. Besides damaging to biodiversity, trafficking can also pose risks to human health. A number of diseases can be transmitted and acquired by the birds, the most commonly detected in the bacterial etiology. Improper management, especially related to transportation and overcrowding, promotes increased susceptibility to infections of birds or even the activation of latent infection with subsequent spread of pathogens. For these reasons this study aimed to conduct research and determine the Enterobacteriaceae resistance of strains of Escherichia coli, as well as raising the frequency of Chlamydophila spp. of parrots seized in actions to combat trafficking of wild animals in Goiás, with proper authorization from the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA / GO). For this, 300 parrots in a period of one year were enrolled in the Screening Center of Wild Animals (CETAS), in Goiânia, Goiás, and underwent clinical and laboratory examinations. For Research Enterobacteriaceae were collected excreta from the bottom of cages, lined with aluminum foil and packed in ice for transport to the laboratory where they were examined by conventional bacteriological method. For the presence of Chlamydophila psittaci 300 cloacal swabs and 300 tracheids were collected and analyzed by polymerase chain reaction (PCR). We have identified the following excreta bacteria of the Enterobacteriaceae: Escherichia coli, 172/300 (33.87%), Enterobacter spp. 153/300 (30.12%), Klebsiella spp. 89/300 (17, 73%), Citrobacter spp. 9 / 300 (11.71%), Proteus vulgaris 21/300 (4.23%), Providencia alcalifaciens 5 / 300 (0.98%), Serratia sp.5/300 (0.98%), Hafnia aivei 3 / 300 ( 0.59%) and Salmonella sp. 1 / 300 (0.19%). Escherichia coli isolates were tested using the sensitivity to antibiotics, which revealed: amoxicillin (10mg) (70.93%), ampicillin (10mg) (75.58%), ciprofloxacin (5μg) (69.76%), chloramphenicol (30μg) (33.14% ), doxycycline (30μg) (64.53%), enrofloxacin (5μg) (41.28%), tetracycline (30μg) (69.19%), sulfonamide (300μg) (71.51%) of antimicrobial resistance. Of samples, 11/300 (3.66%) were positive in PCR analysis for Chlamydophilla spp. The results suggest that parrots from illegal trade are potential backers of zoonotic agents, and also point to the possibility that wild birds would constitute support for transfer of resistant phenotypes of E. coli to the human microbiota and other animalsItem Qualidade física, química e microbiológica de ovos lavados armazenados sob duas temperaturas e experimentalmente contaminados com Pseudomonas aeruginosa(Universidade Federal de Goiás, 2010-03-02) MENDES, Fernanda Rodrigues; LEANDRO, Nadja Susana Mogyca; http://lattes.cnpq.br/3136809931691012; STRINGHINI, Maria Luiza Ferreira; http://lattes.cnpq.br/3705544548242014; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467The objective of this study to verify the physical, chemical and bacteriological egg-washed and not washed undergoing experimental infection with Pseudomonas aeruginosa and stored at 5 oC and 25 oC during the 30 days. We used 768 eggs without cracks and classified as large, hens line Dekalb White, 30 to 40 weeks of age, and 384 for physical and chemical quality and 384 for bacteriological quality. The experimental design was in blocks of two stages and in factorial 2 x 2 x 2 (contamination, washing and storage temperature) with six repetitions for variables of physical, chemical and bacteriological. Eggs were contaminated by handling, with 1.5 x 105 units forming colonies (CFU) of Pseudomonas aeruginosa / mL and remained 5c and stored at 25oC for 30 days. Every 10 days were analyzed physical quality of eggs (egg weight, specific gravity, thickness shell, yolk percentage, albumen and shell, Haugh unit, yolk index and albumen), chemistry (pH of albumen and yolk) and bacteriological (count bacteria on the shell and contents of the egg). To analyze the weight loss of eggs at 30 days were used 96 eggs weighed every three days. The experimental design was randomized blocks in factorial 2 x 2 x 2 (Contamination washing x x storage temperature), with six replicates and one egg per experimental unit. It was observed that the cooling maintained the internal egg quality even when there was contamination in shell with inoculum of Pseudomonas aeruginosa (p <0.05). It was concluded that the Refrigeration slows weight loss and provides better internal quality, physics, and chemistry of eggs during the 30 days of storage (p> 0.05), independent of the contamination and the washing process. Best values internal quality were obtained in chilled eggs (p <0.05), eggs stored at 5 ° C had lower bacterial counts (p <0.05). It was concluded that the cooling provides better quality of bacteriological eggs during 30 days of storage and that there was more growth bacterial washed eggs and especially the content of the eggs.Item Fonte de infecção e do perfil de resistência a antimicrobianos de Salmonella sp. isoladas de granjas de frango de corte(Universidade Federal de Goiás, 2010-03-26) MORAES, Dunya Mara Cardoso; NUNES, Iolanda Aparecida; http://lattes.cnpq.br/2555738917312914; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467The objective of this research to investigate the presence of Salmonella sp. in raw materials of animal origin used in the manufacture of feed for broilers, in diets collected directly from bird feeders, and in organs ceca contents and liners carry case for newly hatched chicks, in environmental samples, in samples from swabs of the hands of officials of the farm and slaughterhouse samples and classify and determine the resistance of strains of Salmonella sp. found, before the action of chemotherapeutic nine. For data analysis was descriptive frequency results. 1200 samples were collected from flour and Salmonella sp. was found in 10.5% of samples with a predominance of serovar Enteritidis. The frequency of bacteria in meat meal was 12%, 6.8% in blood, the feathers of 4.3% and 14.6% in the viscera. Were also isolated Salmonella Cerro, Salmonella Montevideo, Salmonella anatum, Salmonella Tennessee, and Salmonella typhimurium among others. Regarding the resistance of strains found in the various categories of flour was observed resistance to sulfonamides, neomycin, tetracycline, sulphamethoxazole-to trimetopim and florfenicol. Of the three strains of bacteria isolated from two diets were of a Salmonella enteritidis and S. Anatum, showing resistance to sulfonamides and neomycin. Of the 32 batches of newly hatched chicks 9.4% were positive for Salmonella and 32 batches of liners carrying case 9.4%. Environmental samples, before bed accommodation, swabs of feeder and drinker and the drinking water of birds tested negative for Salmonella sp .. Drag swabs of poultry manure, and samples Alphitobius diaperinus swabs from the hands of officials of the farms had a frequency of 12.5%, 12.5% and 6.5% respectively. In samples from swabs of drag serovar Enteritidis was the most frequent and catfishes of the samples and swabs of hands was the only serovar isolated. In samples from slaughterhouse 26.7% of the lots from crop and 33.3% of batches of ceca were positive for Salmonella sp .. Regarding the resistance of strains, there was resistance sulfonamides, the amoxicillin and enrofloxacin in samples of newly hatched chicks and amoxicillin in the samples of liners carrying case. In drag swabs and samples of catfishes, the bacteria were resistant to sulfonamides. In samples from crop, were resistant to sulfonamide and enrofloxacin and the caeca to sulfonamides, the trimetopim-sulphamethoxazole, tetracycline, amoxicillin and ampicillin to.Item Aspectos epidemiológicos da leishmaniose visceral canina nas regiões administrativas Lago Norte e Sobradinho II do Distrito Federal - DF(Universidade Federal de Goiás, 2011-08-31) NASCIMENTO, Geovani San Miguel; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467This study aimed to determine the prevalence and epidemiological aspects of canine visceral leishmaniasis in Lago Norte and Sobradinho II, administrative regions of the Federal District. Census surveys were conducted in four localities of the Federal District where the data were collected and blood sampled from 5,551 dogs in Lago Norte and from 272 dogs in Varjão and from 836 dogs from Bananal and Engenho Velho communities in Sobradinho II. We evaluated age, sex, breed, presence of clinical signs, wooded homes, the presence of the garden, organic material, home situation and the presence of chicken in the properties. The sera samples were submitted to indirect immunofluorescence test (IFA), and samples with reagent titers greater than or equal to 1:40 were considered positive. Prevalences of 6.66% (17/255), 13.13% (44/335), 15.40% (61/396) and 22.32% (1013/4538), were found in Varjão, Engenho Velho, Bananal and Lago Norte. Regarding age, 10.90% (70/643) were aged up to one year, considered a young population, 22.40% (619/2763) were at one to six years of age, considered as a middle-aged population, and 24.00% (297/1236) were older than six years of age, corresponding to old animals. Regarding the presence or absence of clinical signs, 30.31% (238/785) had some clinical changes and 18.61% (846/4544) showed no clinical changes. One can conclude that this canine visceral leishmanias is distributed in different regions of the Federal District being the location, the age and the presence of clinical changes the highest risk factors The knowledge gained on the prevalence of leishmaniasis in dogs will allow the establishment of effective strategies for control actions.Item Controle de Salmonella Typhimurium em frangos de corte uti- lizando composto com ácido benzóico, fumárico e 2-hidróxi-me- tiltio-butanóico(Universidade Federal de Goiás, 2008-07-24) ROCHA, Tatiane Martins; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467Item Controle de Salmonella Typhimurium em frangos de corte utilizando lactose(Universidade Federal de Goiás, 2009-07-25) SOUZA, Eliete Silva e; STRINGHINI, José Henrique; http://lattes.cnpq.br/8505634095383289; CAFÉ, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467This study was conducted at the Experimental Center of Poultry Diseases and Laboratory of Bacteriology Department of Veterinary Medicine Veterinary School, Federal University of Goias to evaluate the effects of lactulose in Salmonella typhimurium in broilers. The experimental design was completely randomized, evaluating substance applied (lactulose) and bacterial challenge. We used 630 chicks of commercial strain, which were distributed in six treatments with seven replicates and 15 birds per experimental unit. The microbial challenge was provided to birds in the first days of life containing 5.0 X 102 CFU / 0.5 mL of Salmonella typhimurium. And lactulose at a dose of 0.023 mL / g of body weight up to 14 days of age. The weights of the birds and feed intake were seen weekly for performance measurement. On days seven, 14, 21 and 28, one bird per treatment was necropsied, and liver collected for biometric analysis and histopathological. The contents of ingluvie and caeca were submitted to enumeration of Salmonella and Escherichia coli and bacterial analysis, as well as the spleen, liver and heart were examined bacteriologically. Was also measured the pH of ingluvie, small intestine and cecum and blood collected for evaluation of liver enzymes. The quantitative performance data, biometrics liver, pH, bacterial count and liver enzymes were analyzed by applying ANOVA and Tukey (5%), and data resulting from analysis of fecal excretion of Salmonella were analyzed using the nonparametric chi-square . There was greater weight gain and lower feed conversion (P <0.05) in groups receiving lactulose with or without S. Typhimurium to 21 days of life and decreased fecal excretion of S. Typhimurium at 10 days of age for birds fed lactulose (P <0.05) from the first days of life. It was also found that the lactulose caused decrease in values (P <0.05) pH in the organs of the digestive system for seven days of life and that lactulose decreased (P <0.05) the CFU of E. coli in ingluvie at 21 and 28 days and S. Typhimurium in the treatments administered lactulose before the pathogen and ages. Lactulose prevented infection in the early period of life for birds, showing a better effect when administered 48 hours before inoculation. It was also that there was an increase in relative liver weight by S. Typhimurium in all ages studied and that the lactulose caused mild liver abnormalities, and it was also found that the S. Typhimurium did not cause severe clinical signs or mortality and that its recovery rate decreased with age. It can be concluded that lactulose causes greater weight gain in birds until one week after delivery, as well, was able to decrease the fecal excretion of S. Typhimurium. It also appears that the lactulose changed the pH values, except pH and reduced cecal colonization of S. Typhimurium in the cecum and the number of CFU of E. coli in ingluvie. It is also concluded that lactulose was able to prevent systemic infection while being provided, showing better preventive effect, and also ordered discrete liver, a process similar to congestiveItem Inquéritos soroepidemiológicos em eqüinos da região Sul do Brasil para detecção de anticorpos anti-flavivírus de interesse em saúde pública(Universidade Federal de Goiás, 2010-07-02) VIANNA, Ricardo da Silva Teixeira; JAYME, Valéria de Sá; http://lattes.cnpq.br/0603234425928309; BRITO, Wilia Marta Elsner Diederichsen de; http://lattes.cnpq.br/7605775995731168; ANDRADE, Maria Auxiliadora; http://lattes.cnpq.br/9441751521255467The arboviruses are diseases that affect humans, horses and other animal species causing in the majority of cases an asymptomatic infection to neurological disorders. The Flaviviruses are important arbovirus found in Brazil. A descriptive study was conducted from serological surveys in 1775 horses for detection of anti-Flavivirus antibodies in the State of Paraná (Foz do Iguaçú, Maringá and Barracão), Santa Catarina (São Miguel do Oeste, Guaraciaba, Iraceminha, Dionisio Cerqueira, Guarujá do Sul and São José do Cedro) and Rio Grande do Sul (Uruguaiana, São Borja, Itaqui Alegrete and Porto Alegre) in the years of 2007 and 2008. By testing hemagglutination inhibition (HI) were detected HI antibodies of Saint Louis and Ilhéus and other Flaviviruses included in the tests, as well as cross-reactivity for Flaviviruses. By HI test, 14.3% (254/1775) of animals were positive for Flavivirus, monospecific reactions were observed in 42.9% (109/254) serum samples, being that 78.9% (86/109) for St. Louis, 17.4% (19/109) for Ilhéus and 3.7% (4 / 109) for Rocio and cross-reactions were detected in 57.1% (145/254). Among the positives, there was no difference between the sexes. The age group ≥ 10 years old was the most affected with 35.4% (73/206). The animals used for the practice of sport were positive in 34.3% (87/254). The state of Paraná showed 16.3% (107/657) of reacting animals, followed by Rio Grande do Sul with 15.1% (142/939) and Santa Catarina with 2.8% (5/179). This study brings new data regarding the immunity of horses against Flaviviruses in Brazil, and confirms the wide distribution of St. Louis and Ilhéus and the diversity of Flavivirus in the country, as well as the apparent absence of clinical disease in horses infected with the virus studied.