Soroprevalência de Maedi-visna em rebanhos ovinos do estado do Maranhão, Brasil

Teixeira, Whaubtyfran Cabral; Nascimento, Edísio Alves; Nascimento, Sérgio Alves do; Mavulo, Maria Fernanda Vianna; Rizzo, Huber; Silva, Jean Carlos Ramos; Castro, Roberto Soares de

doi:10.4322/rbcv.2016.028

Cited by 6 publications

(10 citation statements)

References 11 publications

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“…Data from Pernambuco revealed 5.2%, 1.07% and 0.26% seropositivity (OLIVEIRA et al, 2006;COSTA et al, 2007;MELO et al, 2016). In Maranhão and Ceará, seropositivity prevalence was 0.7% (TEIXEIRA et al, 2016b) and 31.67%, respectively (ALMEIDA et al, 2003). The fact that the latter study sampled sheep showing clinical signs of pneumonia likely explains the considerably higher seropositivity, as the other reports focused on herds lacking animals exhibiting symptoms compatible with MVV.…”

Section: Discussionmentioning

confidence: 99%

Epidemiological characterization and risk factors associated with lentiviral infection of small ruminants at animal fairs in the semiarid Sertão region of Pernambuco, Brazilian semiarid

Alves

Limeira

Lima

et al. 2017

SCA

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Animal agglomerations at commercial events such as trade fairs represent an important facilitator in infectious disease transmission. Thus, it is crucial to understand the epidemiology of infectious diseases in small ruminants. The objective of this study was to examine lentiviral presence in goats and sheep traded at the animal fair of Tabira city (Sertão region of Pernambuco) and identify possible risk factors associated with infection. We collected serum samples from 233 crossbred goats and 119 crossbred sheep, belonging to 12 breeders, at the Tabira livestock fair from November 2014 to June 2015. An epidemiological questionnaire was used to analyze the risk factors. Agar gel immunodiffusion (AGID) and western blotting (WB) were performed to diagnose small ruminant lentivirus (SRLV) infection. In the AGID test, we used maedi-visna virus (MVV) antigens for sheep and caprine arthritis/encephalitis virus (strain Cork) (CAEV-Co) antigen for goats. The WB analysis used CAEV-Co antigen for both species. Variables from the questionnaire were analyzed with univariate and multivariate statistics. One seropositive goat but no sheep was identified via AGID. According to the WB results, 15/233 goats (6.44%; CI95% = 3.94 -10.35%) and 8/119 sheep (6.72%; CI95% = 3.45 -12.71%) were seropositive, totaling 23/352 reactive animals (6.53%; CI95% = 4.39 -9.61%) from 12 herds. Annual vermifugation of the animals was a significant risk factor (odds ratio = 5.9; CI95% = 1.7-19.8; p = 0.04) for disease in goats, but no variables associated with infection risks were identified in sheep. We concluded that SRLV was present in goats and sheep at the animal fair. Western blots were more sensitive than AGID for SRLV diagnosis. Practices aiming to improve sanitary management may reduce the risk of infection in goats. All studied herds included animals identified as seropositive for SRLV. Therefore, we recommend adopting measures that increase disease diagnosis while intensifying traffic control and surveillance of animal agglomerations.

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Section: Discussionmentioning

confidence: 99%

Epidemiological characterization and risk factors associated with lentiviral infection of small ruminants at animal fairs in the semiarid Sertão region of Pernambuco, Brazilian semiarid

Alves

Limeira

Lima

et al. 2017

SCA

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“…In this study, 62.5% of the flocks were Santa Inês breed and without defined breed (SRD). It should be noted that to the extent that a flock passes through a breeding process, both goat and sheep, there is a trend of increasing prevalence of diseases, such as the lentiviruses (TEIXEIRA et al, 2016a;TEIXEIRA et al, 2016b). In the present study it was observed a predominance of SRD animals and without zootechnical bookkeeping, which may have influenced the low prevalence found.…”

Section: Discussionmentioning

confidence: 41%

Serological evidence and spatial analysis of small ruminant lentiviruses in herds in Maranhão, Brazil

Soares

Júnior²,

Soares

et al. 2020

AVB

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Caprine arthritis encephalitis and Maedi-Visnaare lentiviruses affecting goats and sheep, respectively. Despite the literature having studies about these diseases, there is a constant demand and the need to study the health status of flocks that exploit economically. Therefore, this study aimed to assess the frequency of small ruminant lentiviruses explored in regional locations of Chapadinha and Itapecuru Mirim, that compose the microregion of Low Parnaíba, Maranhão, Brazil, as well as analyze the spatial distribution of outbreaks in the studied regions. Therefore, 241 properties were visited, where blood was collected in 1150 sheep and 1260 goats and tested by agar gel immunodiffusion (AGID). Epidemiological questionnaire was applied and collected the geographic coordinates. There was a low frequencyfor lentivirus, with 0.39% (5/1260) of goats and 0.08% (1/1150) of sheep. Regarding the spatial analysis, the reagent flocks were distributed in strategic cities for commercialization throughout the microregion. There was a low occurrence of lentiviruses.The municipalities of Cantanhede and Pirapemas of the regional of Itapecuru Mirimand Brejo and Magalhães de Almeida had reagent flocks for CAE. Whereas the municipality of Matões do Norte presented flock reagent to Maedi-Visna, this belonging to the regional of Chapadinha.

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“…However, the presence of reactive sheep in the north mesoregion may be due to the fact that this region had the highest concentration of sheep breeders in the study area, as well as the greatest number of cities, properties and animals sampled. Teixeira et al (2016) observed an overall prevalence of MVV of 0.7%, and prevalences of 0.5%, 0.7%…”

Section: Resultsmentioning

confidence: 88%

Prevalence and risk factors associated with Maedi-Visna infection in sheep in the State of Maranhão, Brazil

Vargens¹,

Prazeres²,

Barros³

et al. 2021

RSD

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In order to determine Maedi-Visna virus (MVV) seroprevalence and risk factors associated with infection in sheep, 445 animals of both sexes and different ages were tested using the Agarose Gel Immunodiffusion technique (IDGA). The animals were divided into two groups: group 1 composed of exhibition animals (n=70) and group 2 composed of animals from properties from the north, east and central mesoregions of the state of Maranhão (n=375). The general prevalence of MVV infection was 2.02%; 1.42% in group 1 and 2.13% in group 2. In the north mesoregion the prevalence was 2.20%, while a total of 40% of the animals living in municipalities for MVV. It was observed that 1.15% of males and 2.23% of females were seropositive (p> 0.20). Regarding breeds, the Dorper (1.66%); Santa Inês (1.67%); White Dorper (33.33%) and Texel (4.34%) were the most affected. This was the only variable among all the risk factors studied that had a significant association in multivariate analysis (p <0.05). MVV infection is present regardless of the purpose of breeding, and the animals are exposed to the same risk of infection. This demonstrates the need to implement public policies for the prevention, control, and eradication of this disease.

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Soroprevalência de Maedi-visna em rebanhos ovinos do estado do Maranhão, Brasil

Cited by 6 publications

References 11 publications

Epidemiological characterization and risk factors associated with lentiviral infection of small ruminants at animal fairs in the semiarid Sertão region of Pernambuco, Brazilian semiarid

Epidemiological characterization and risk factors associated with lentiviral infection of small ruminants at animal fairs in the semiarid Sertão region of Pernambuco, Brazilian semiarid

Serological evidence and spatial analysis of small ruminant lentiviruses in herds in Maranhão, Brazil

Prevalence and risk factors associated with Maedi-Visna infection in sheep in the State of Maranhão, Brazil

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