Ocorrência de anticorpos anti-Brucella ovis em ovinos com histórico de distúrbios reprodutivos no estado de São Paulo, Brasil

Rizzo, Huber; Gregory, Lílian; Beraldi, Fidel; Carvalho, Aline Feola de; Pinheiro, Eliana Scarcelli; Paulin, L.

doi:10.1590/1808-1657001072012

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…According to ADAMS et al (1993), intensive rearing favors horizontal disease transmission, as there are high stocking rates in feedlots, in addition to the use of collective milk bottles. Probably, due to other equally important factors, the data obtained in the present study were not as high as the results observed in other studies, such as the findings by EISTEN et al (1999) in Argentina (18%) and by AZEVEDO et al (2004) in the state of Rio Grande do Norte (11.3%).…”

Section: Seroprevalence Of Ovine Brucellosis In the Microregion Of Tecontrasting

confidence: 90%

Seroprevalence of ovine brucellosis in the microregion of Teresina, Piauí, Brazil

et al. 2020

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Among the diseases that affect the reproductive system of domestic animals, brucellosis in the sheep species is important because it generates significant economic losses to sheep rearing. Thus, it is a threat to the growth and productivity of sheep herds. In the face of this problem, the objective of the present research was to identify the prevalence of ovine brucellosis in herds in municipalities of the Teresina, Piauí, Brazil microregion by using the agar gel immunodiffusion assay (AGID) and indirect enzyme-linked immunosorbent assay (ELISA) serological tests. Fourteen municipalities were included in the research. Blood samples were collected from 521 pubescent animals by puncturing the jugular vein. After collection, the samples were submitted to the serological techniques, AGID and indirect ELISA, to detect anti B. ovis antibody. Of the 521 samples submitted to the AGIDtest, 23 (4.41%) were sera reagent and 498 (95.58%) negative. The indirect ELISA tests, 24 (4.61%) suspect samples and 497 (95.39%) negative samples were obtained, and there were no reagent animals in this test, only suspect. The seroprevalence of ovine brucellosis in the Teresina, Piauí microregion was 4.41%. Thus, it is possible to identify sheep with reagent serology to infection by B. ovis, that is present in municipalities in the state of Piauí, Brazil. Furthermore, AGIDwas shown to be more sensitive in detecting animals that had had contact with the etiological agent of the disease.

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Section: Seroprevalence Of Ovine Brucellosis In the Microregion Of Tecontrasting

confidence: 90%

Seroprevalence of ovine brucellosis in the microregion of Teresina, Piauí, Brazil

et al. 2020

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“…Lower results were also recorded by Silva et al (2009) in Bahia (BA), Rizzo et al (2009) In 43.75% of the properties studied, there was no presence of animals that were reagent in AGID for Brucella ovis. Similar situation was also found by Salaberry et al (2011) in Uberlândia (MG) and Marinho et al (2012), in the northwestern region of the state of São Paulo (SP).…”

Section: Discussionmentioning

confidence: 50%

Leptospirosis and brucellosis seroepidemiology in sheep and dogs from non-mechanized rural properties in the northwestern region in the state of Paraná

Oliveira

Zaniolo

Dias

et al. 2016

SCA

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Sheep breeding has been important in agribusiness, transforming the Brazilian productive scenario. However, it is still deficient due to the damages caused by infectious diseases. Leptospirosis is a severe disease with global distribution, caused by bacteria from the Leptospira genre affecting both humans and animals. The general infection is unapparent, or its clinical signs, when present, are similar to other infections. Brucellosis is an infectious disease caused by bacteria from the Brucella genre responsible for reproductive disorders in animals, especially ruminants. The purpose of this paper was to seroepidemiological study of Leptospira spp. and Brucella ovis in sheep and dogs from nonmechanized rural properties from the northwestern region in the state of Paraná, Brazil. In order to detect anti-Leptospira antibodies, microscopic agglutination (MAT) was performed. For anti-Brucella antibodies, the agar gel immunodiffusion assay (AGID) was performed. From the total 542 samples from sheep sera analyzed, 11.25% were considered reagent to Leptospira spp. and 18.26% to Brucella ovis. From the 36 dog samples, 25% were reagent to MAT and AGID. From the 32 properties analyzed, 75% were considered positive for leptospirosis and 56.25% for brucellosis. Antibodies against the most probable serovars were Hardjo (34.42%) and Butembo (44.44%) in sheep and dogs, respectively, and the variable exchange of animals among properties was associated to leptospiric infection (p=0.028) in sheep. Leptospirosis and brucellosis are present in the sheep herd and dogs in the rural properties studied, and such result is a warning of the zoonotic importance and the need to establish sanitary programs directed to these animal species. ResumoA ovinocultura tem se destacado no agronegócio, transformando o cenário produtivo do Brasil, porém ainda possui uma deficiência devido aos danos causados por doenças infecciosas. A leptospirose é uma doença grave de distribuição mundial causada por bactérias do gênero Leptospira que afeta o homem e os animais. A infecção geralmente é inapetente, ou os sinais clínicos, quando presentes, são similares aos de outras infecções. A brucelose é uma enfermidade infecciosa causada por bactérias do gênero Brucella responsáveis por desordens reprodutivas nos animais, especialmente nos ruminantes. O objetivo deste trabalho foi realizar um estudo soroepidemiológico de Leptospira spp. e Brucella ovis ovinos e cães de propriedades rurais não tecnificadas da região noroeste do estado do Paraná, Brasil. Para detecção de anticorpos anti-Leptospira foi realizada a soroaglutinação microscópica (SAM), e para anticorpos anti-Brucella, a prova de imunodifusão em gel de ágar (IDGA). Das 542 amostras de soro ovino analisadas, foram consideradas reagentes 11,25% para Leptospira spp. e 18,26% para Brucella ovis. Das 36 amostras de cães, 25% foram regentes a SAM e IDGA. Das 32 propriedades, 75% foram consideradas positivas para leptospirose e 56,25% para brucelose. Os anticorpos contra os sorovares mais prováveis for...

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“…The microscopic agglutination test (MAT), was performed against the following 24 lepstopira serovars: Australis, Bratislava, Autumnalis Castellonis, Bataviae, Canicola, Whitcombi, Cynopteri, Sentot, Grippotyphosa, Hebdomadis, Icterohaemorrhagiae, Copenhagen, Javanica, Panama, Pomona, Pyrogenes, Patoc, Hardjo (Hardjoprajitno), Hardjo (Hardjobovis), Wolffi, Shermani, and Tarassovi [6]. Seroreactivity against B. ovis was analysed by complement fixation [21], and against T. gondii and N. caninum was by indirect immunofluorescence assay (IFA), it was considered a cutoff point of 1:50 for T. gondii [5] and 1:64 for N. caninum [3]. The bacterial isolation of Campylobacter sp.…”

Section: Blood Collection and Laboratory Testsmentioning

confidence: 99%

Is Bluetongue Virus a Risk Factor for Reproductive Failure in Tropical Hair Sheep in Brazil?

Rizzo

Balaro

Matos

et al. 2021

Acta Scientiae. Vet.

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Background: Bluetongue is a vector-borne viral disease transmitted by midges from the genus Culicoides. The disease can infect most of the ruminant and camelid species, but the severe disease is most often seen in european wool and mutton sheep breeds. In this sense, there is a gap in the knowledge on BTV infection in hair sheep breeds from tropical zones. Thus, this study aimed at establishing whether exposure to BTV is a risk factor for reproductive failure in Santa Inês ewes, a hair sheep breed, reared under tropical conditions in Brazil.Materials, Methods & Results: A retrospective cross-sectional study was carried out in sheep farms in São Paulo state, Brazil, after the rainy season. Serum samples from 110 Santa Inês ewes with a history of reproductive disorders, in the last 6 months, which were included: abortion, premature birth, stillbirth, retention of placenta, infertility, estrus repetition, fetal malformation, weak lamb birth and neonatal death were collected. The presence of antibodies against BTV was assessed by agar gel immunodiffusion method (AGID). Serology to the infectious agents Brucela ovis, Lepstopira spp., Toxoplasma gondii, Neospora caninum and Campylobacter sp. were also assessed. Bivariate associations between the outcome and individual explanatory variables were assessed using the Fisher's exact test. Abortion was the most common reproductive disorder (53%; 74/139) observed, followed by estrus repetition (12%; 17/139) and infertility (11%; 15/139). Other disorders related to the conceptus totaled nearly one fourth of the reported disorders. A total of 20% (22/110) of the ewes were seropositive to BTV. A higher frequency of BTV seropositive than BTV seronegative ewes with a history of abortion was found. Also, abortion with seroreactivity to BTV was tested for prevalence ratio that showed 1.38 [95% CI 1.10-1.74; P = 0.030]. With regards to the abortion involvement of other infectious diseases associated with the seropositive ewes to BTV, more than a half of ewes (53%; 10/19) were solely seropositive for BTV.Discussion: In the current study, it was detected 20% (22/110) of seropositive ewes to BTV. These findings demonstrated that even though the BTV has been considered endemic in tropical countries such as Brazil, there are regions or microclimates in which the virus cannot be present or in varied prevalence. The history of abortion was identified as the potential factor associated with BTV seropositivity in Santa Ines ewes. Equally, the differential diagnosis for other infectious agents related to abortion demonstrated the unique presence of antibodies against BTV in more than half of all cases. Other studies with native sheep flocks in Iran and Nepal also demonstrated a strong positive correlation between abortion history and seropositivity for BTV. Thus, it is possible that in other continents of the world, under tropical conditions, the virus does not behave the same asymptomatic infection such as have been reported for native sheep breeds in Africa. In conclusion, it was demonstrated that one-fifth animals were positive for antibodies against BTV clearly implying the viral spreading in the local hair sheep flocks. These findings highlight the importance of surveillance related to BTV in endemic areas. Therefore, it is recommended to strengthen the surveillance system for BTV within Brazil and to educate farmers about the management and control of this disease.

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Ocorrência de anticorpos anti-Brucella ovis em ovinos com histórico de distúrbios reprodutivos no estado de São Paulo, Brasil

Cited by 7 publications

References 18 publications

Seroprevalence of ovine brucellosis in the microregion of Teresina, Piauí, Brazil

Seroprevalence of ovine brucellosis in the microregion of Teresina, Piauí, Brazil

Leptospirosis and brucellosis seroepidemiology in sheep and dogs from non-mechanized rural properties in the northwestern region in the state of Paraná

Is Bluetongue Virus a Risk Factor for Reproductive Failure in Tropical Hair Sheep in Brazil?

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