Neospora caninum  seroprevalence and risk factors for ewes from  Santa Catarina Plateau, Brazil

Moura, Anderson Barbosa de; Güths, Marcelo Felipe; Farias, Juliana Antunes; Souza, Antônio Pereira de; Sartor, Amélia Aparecida; Quadros, Rosiléria Marinho de

doi:10.5433/1679-0359.2014v35n5p2591

Cited by 6 publications

(11 citation statements)

References 28 publications

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“…In the Paraná state, Neospora spp. was found in 88.9% (8/9) of the farms (ROMANELLI et al, 2007), and in 81.8% (9/11) of the farms, with infection rates ranging from 0 to 32.3% (MUNHÓZ et al, 2010). In contrast, only 42.4% (39/92) of the farms had Neospora spp.…”

Section: Discussionmentioning

confidence: 96%

“…This low frequency could be considered noticeable if compared to the 3.5% found in a similar study in the state of Sao Paulo, Brazil (FIGLIUOLO et al, 2004). Prevalence studies, demonstrating the susceptibility of sheep to these protozoa, show infection rates from 0 to 64.2% for Neospora spp., and from 6.3% to 100% for T. gondii (DUBEY;LINDSAY, 1996;DUBEY, 2003;TEMBUE et al, 2011;GUIMARÃES et al, 2013;MOURA et al, 2014). Infection rates range depending on the diversity of epidemiological factors that occur in each flock (SOARES et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…However, seroprevalence ranging from 20 to 69.2% was detected in the Mato Grosso do Sul state (OSHIRO et al, 2015). Studies indicate that such variations can result from differences related to factors as: flock management, water sources, presence (or quantity) of dogs on the farm, farm size, climatic conditions, presence of other animal species on grazing areas, animals' origin, age and breed, and veterinary supervision (ROSSI et al, 2011;DALLA ROSA et al, 2011;MOURA et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, only 42.4% (39/92) of the farms had Neospora spp. seropositive sheep, with seroprevalence rates from 0 to 40%, in a study performed in the Plateau region of Santa Catarina state (MOURA et al, 2014 Neospora spp. infection frequencies from 0 to 33.3% were found in the studied flocks (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

“…Epidemiological studies regarding these parasites in sheep are commonly based on serological diagnosis, but different techniques and cutoffs can be used for positive sample identification (FIGLIUOLO et al, 2004). The recent resumption in Brazilian sheep production reinforces the importance of studies on diseases, such as neosporosis and toxoplasmosis, which can cause major economic losses to sheep farms (MUNHÓZ et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Neospora spp. and Toxoplasma gondii infection in sheep flocks from Rio Grande do Sul, Brazil

Ferreira

Vogel

Sangioni

et al. 2016

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Neospora caninum and Toxoplasma gondii are coccidian parasites (protozoa: Apicomplexa) that cause reproductive losses in ruminants. Although, in sheep, abortion is generally related to T. gondii, potential damage caused by N. caninum must be considered. The aims of this study were to evaluate the frequencies of antibodies against Neospora spp. and T. gondii, and to identify the risk factors related to neosporosis and toxoplasmosis in sheep from ten flocks located in Central-Western, Northwestern, Southwestern, and Southeastern mesoregions of the Rio Grande do Sul state, southern Brazil. Blood samples were collected from 300 sheep (30 per flock) and an epidemiological questionnaire was completed by the farmers. The presence of canids, felids, and rodents, the sources of water for the animals, and their reproductive history were investigated as potential epidemiological factors related to the studied infections. Serum samples were tested by the indirect fluorescent antibody test for the presence of antibodies against Neospora spp. (cutoff 1:50) and T. gondii (cutoff 1:64), with respective frequencies detected being 16.3% (49/300) and 41.3% (124/300). Seropositivity to both parasites was observed in 8% (24/300) of the animals. Neospora spp. and T. gondii were present in 90% (9/10) and 100% (10/10) of the flocks, respectively. The presence of cats in the pastures, pens, and barns was significantly associated (p=0.047) with high frequencies (53.3% to 70%) of antibodies against T. gondii in the flocks. However, no associations were detected (p>0.05) between each of the other risk factors and the frequency of antibodies against Neospora spp. or T. gondii. Results of this study showed a broad distribution of both protozoa in evaluated sheep flocks. Key words: Antibodies. Epidemiological survey. Neosporosis. Toxoplasmosis. Serology. Ifat. ResumoNeospora caninum e Toxoplasma gondii são parasitos coccídeos (protozoa: Apicomplexa) que causam perdas reprodutivas em ruminantes. Embora o aborto em ovinos geralmente esteja associado a T. gondii, potenciais perdas causadas por N. caninum devem ser consideradas. Os objetivos deste estudo foram

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neospora spp. and Toxoplasma gondii infection in sheep flocks from Rio Grande do Sul, Brazil

Ferreira

Vogel

Sangioni

et al. 2016

SCA

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Ocorrência de anticorpos anti-Toxoplasma gondii e anti-Neospora caninum em ovinos com distúrbios reprodutivos e fatores de risco

et al. 2018

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RESUMO: Objetivou-se avaliar a ocorrência, sinais clínicos e fatores de risco associados a soropositividade para Toxoplasma gondii e Neospora caninum em ovinos. Foram utilizados 294 animais com histórico de distúrbios reprodutivos de 28 fazendas do estado de São Paulo, Brasil, diagnosticados através da imunofluorescência indireta (1:64 e 1:50). A ocorrência de T. gondii foi de 29,9% (88/294) e de N. caninum 18% (53/294), sendo 3,7% (11/294) dos ovinos soropositivos para ambos. Observou-se com maiores chances à infecção pelo T. gondii: ovinos mestiços (p=0,04), Santa Inês (p=0,006), fornecimento de pastagem (p<0,001) ou associada a concentrado (p<0,001), uso exclusivamente de monta natural (p=0,002, OR=2,28 e IC95%=1,37-3,79) e a presença de aves nas propriedades (p=0,001). Na infecção por N. caninum essa chance aumentou em: fêmeas (p=0,031), propriedades sem aprisco (p<0,001) e sistema de criação semi-intensivo (p<0,001). Em relação ao histórico de problemas reprodutivos, ovelhas infectadas pelo N. caninum e T. gondii apresentaram redução da chance de apresentarem abortamento (p=0,044) e repetição de estro (p=0,025) respectivamente. O T. gondii esteve mais presente sorologicamente que o N. caninum em ovinos com histórico de distúrbios reprodutivos e apesar de suas semelhanças, diferiram epidemiologicamente em aspectos relacionados as características da criação como raça, sexo, sistema de criação, tipo de alimentação e manejo reprodutivo.

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Pesquisa de anticorpos IgG para Neospora caninum e avaliação dos fatores de risco em ovinos do Estado de Sergipe

et al. 2017

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The aim of this study was to determine the occurrence of antibodies IgG against Neospora caninum and evaluate the risk factors associated with the infection in ovine herds, State of Sergipe, Brazil. Blood samples (n=1200) were collected from sheep raised in 60 sheep run located in the three mesoregions of the State of Sergipe, between 2011 e 2012. Antibodies were investigated by Indirect Immunofluorescence Antibody Test of which cutoff point was 50 and positive samples were diluted in base 2 until the last positive titer. Data from 15 variables was obtained from questionnaires given to farmers. Absolute and relative frequencies were determined and the risk factors were analyzed by Pearson's Qui-Square test (p≤0,05). The occurrences of serum reactive sheep were 39.83% (478/1200). The occurrences of positive sheep and sheep run were 55.88% (380/680) and 88.24% (30/34) in the Eastern region; 21.42% (60/280) e 42.85% (6/14) in dry region and 15.83% (38/240) e 41.67% (5/12) in the backwoods respectively. Antibody titers ranged from 50 (n=459), represented 96.02% (459/478) of seropositive samples to 6400 (1/478). Among the significant variables in the multivariate analysis were considered risk factors for infection with N. caninum were, sheep run located in Eastern region (p=0.000, OR=4.64, CI95%=3.36-6.41); standing and running water sources (p=0.000 OR=2.03, CI95%=1.41-2.92), absence of quarantine (p=0.000, OR=2.71, CI95%=2.08-3.53), absence of dunghill (p=0.000, OR=3.14, CI95%=2.45-4.02), presence of dogs (p=0.000, OR=2.74, CI95%=1.73-433), presence of wild animals (p=0.000, OR=3.45, CI95%=2.44-4.87) and subsistence (p=0.000, OR=4.99, CI95%=3.15-7.92) or reproduction (p=0.002, OR=1.74, CI95%=1.22-2.49) livestock were important risk factors. Our results highlight the occurrence of N. caninum in the ovine herds from State of Sergipe. Management and location of sheep runs were important risk factors associated to the infection.INDEX TERMS: Neospora caninum, infection, parasite, sheep, risk factors, indirect fluorescent antibody test.

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Neospora caninum seroprevalence and risk factors for ewes from Santa Catarina Plateau, Brazil

Cited by 6 publications

References 28 publications

Neospora spp. and Toxoplasma gondii infection in sheep flocks from Rio Grande do Sul, Brazil

Neospora spp. and Toxoplasma gondii infection in sheep flocks from Rio Grande do Sul, Brazil

Ocorrência de anticorpos anti-Toxoplasma gondii e anti-Neospora caninum em ovinos com distúrbios reprodutivos e fatores de risco

Pesquisa de anticorpos IgG para Neospora caninum e avaliação dos fatores de risco em ovinos do Estado de Sergipe

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